Alkalic Olivine Basalt

Title

Alkalic Olivine Basalt

Identifier

HA-9

Description

Hand Sample: Aphanitic, light-gray alkalic olivine basalt. Sample contains abundant phenocrysts of feldspar, olivine, and augite. Phenocrysts range in diameter from 0.1cm to 0.5cm. Many of the phenocrysts in sample have an iridescent luster. Sample has very few vesicles, which are generally less than 0.1cm in diameter.
Thin Section: Groundmass of plagioclase grains. Phenocrysts of plagioclase, olivine and augite are abundant throughout sample.

Date

Sample collected January, 1969

Contributor

Western Minerals

Spatial Coverage

1.3 miles northeast of Puu o Kawaiwai, Kohala Mt.
Island of Hawaii