Trachyte Obsidian

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

Geolocation