Mostly mafic obsidian, in small highly angular fragile pieces. Between 30 to 40 very fine-grained massive basalts, average size 400 cm cubed, with layer of obsidian on surfaces (pillows).
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].