Hand Sample: Aphanitic light gray vesicular pumice. Sample has incredibly low specific gravity due to abundant vesicles. Vesicles range in size from less than 0.1cm to 0.3cm. Some vesicles on cut face appear to be filled in with a lighter material. Sample contains blocks of Trachyte Obsidian from sample HA-22.
Thin Section: Groundmass composed of aphanitic glass, opaque minerals, and some plagiocalse. Numerous vesicles are present.
Sample collected in January, 1969.
Is Part Of
Volcanic Phenomena Suite - The Hawaiian Islands of Hawaii and Oahu
Number of Thin Sections