Tholeiitic Basalt

Identifier

HA-14

Description

Hand Sample: Aphanitic medium gray vesicular basalt with scattered olivine crystals. Olivine crystals are commonly growing either in clusters or as one single crystal. Vesicles are found throughout sample and range in diameter from 0.05cm to 2cm.
Thin Section: Groundmass composed of plagioclase grains and glass. Sample contains plagioclase phenocrysts with elongate shape as well as numerous olivine phenocrysts.

Date

Sample collected January, 1969

Contributor

Temporal Coverage

Geolocation