Title
Trachyte Obsidian
Identifier
HA-22
Description
Hand Sample: Aphanitic dark gray trachyte. Sample contains zones with abundant tiny vesicles (less than 0.1cm in diameter), however the majority of the sample does not contain any vesicles or phenocrysts.
Thin Section: Composed of aphanitic plagioclase grains displaying characteristic twinning in addition to a large amount of glass.
Date
Sample collected in January, 1969.
Contributor
Western Minerals
Is Part Of
Volcanic Phenomena Suite - The Hawaiian Islands of Hawaii and Oahu
Spatial Coverage
Puu Waawaa quarry,Hualalai - Island of Hawaii
Number of Thin Sections
1