G103 0639F002RCC001004999      GIR Quartzite                                                                       Slightly foliated                                                                                                                           0.1-0.4 mm                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Quartz              Magnetite           Phyllosilicates                                             95   2    3              95   2    3              0.1-0.4    0.1-0.2    N/A                                                                                                                                                                                                                                                                                        N/A                                               Euhedral, octahedral                              N/A                                                                                                                                                   Interlocking grains, slightly flattened.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Interstitial, muscovite, chlorite, clays(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Fine grained quartzite with weak foliation. Quartz is slightly strained. Interstitial matrix: mostly clays, some chlorite, a few muscovite flakes (very rare, broken). Rock has been fractured, recrystallized (fine grained). No piece number given.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G103 0639F002RCC009011999      GIR Altered silicic, volcanic?                                                      Altered porphyritic                                                                                                                         0.2 - 1 mm                                                                       Feldspar            Quartz                                                                          15   N/A                 15   N/A                 0.4-1.5    0.2-0.4                                                                                                                                                                                                                                                                                               Euhedral-Subhedral                                Rounded                                                                                                                                                                                                 Mostly altered, both K (sanidine?) and Na (albite, small laths) spar, relatively sericitized.                                                                                                                                                             Anhedral.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Altered Groundmass                                                                                  80                       80                       N/A                                                                                                                                                                                                                                                                                                              N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Epidote                                                                                                                                     1    1-2                                                                                                                                                                                                                                                                                                                                                                Minor                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Relatively phenocryst rich (20-25%). Radiating bundles of gray phyllosilicate(?).  Also muscovite laths and broken laths. No piece number given.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y
G103 0639F002RCC018020999      GIR Altered silicic volcanic (rhylolite - dacite)                                   Porphyritic                                                                                                                                 0.2 -1.0 mm                                                                      Quartz              Feldspar                                                                        N/A  N/A                 N/A  N/A                 N/A        N/A                                                                                           Albite, k-spar                                                                                                                                                                                          Rounded                                           Euhedral                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N/A                                                                                                 N/A                      N/A                      N/A                                                                                                                                                                                                                                                                                                              N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Epidote                                                                                                                                     1    1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Groundmass is completely altered. Similar to 639F-2R-CC-9-11cm. No piece number was given, 999 is a dummy value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        N