This sample is made up of two-fine grained, dark, extrusive rock fragments. Both are identified as basalt, although the shipboard description states that one is diabase and the other trachyte.
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].