Two good samples: (1) aphyric fine-grained, ~1% vesicles 0.5 mm, fresh to mild alteration, no glass. 7mm Mn. Also two rocks completely altered, and chunks of yellow sediment with 40mm Mn.
Cite the IMLGS database as: Curators of Marine and Lacustrine Geological Samples Consortium. The Index to Marine and Lacustrine Geological Samples (IMLGS). National Geophysical Data Center, NOAA. doi:10.7289/V5H41PB8 [date of access].