Fragent of obsidian
volcanic glass
GEOLOGICAL SPECIMENSUSA, CA
pyroclastic rock
overall: 1-7/8 x 2-1/4 x 3/8 in.
Volcanic glass; Fragment of obsidian; from the collection of Captain Richard C. Mears (1829-1899); fragment of obsidian (volcanic glass) from Glass Mountain in California (part of the Long Valley Caldera); handwritten on paper attached to back "?lass From/ ?lass mountain." (most likely that missing letters are "g"s).
2005.34.238