G103 0639E003RCC002005999      GIR Altered volcanic, volcaniclastic?                                               Porphyritic                                                                                                                                 0.2-1.5 mm                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           N/A                                                                                                 N/A                      N/A                      N/A                                                                                                                                                                                                                                                                                                              N/A                                                                                                                                                                                                                                                       Groundmass completely altered.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Quartz, albite (An20-30), muscovite, altered mafics (amph?) make up 15% of Primary Mineralogy.  Possible dacite, andesite composition, less silicic than 639F rocks, possibly volcaniclastic.  Phenocrysts are euhedral to rounded.  Groundmass completely altered.  Large, irregular completely altered patches.  No piece number was given, 999 is a dummy value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N