Hawaiite
Hand Sample: Aphanitic light gray hawaiite with inclusions containing numerous vesicles. Inclusions are darker in color with abundant vesicles less than 0.01cm in diameter. The surface of the sample is heavily weathered, resulting in sample's tan color.
Thin Section: Aphanitic groundmass of plagioclase, interstitial glass, and microcrystals of clinopyroxenes.
Sample collected January, 1969
Western Minerals
HA-11
Alkalic Olivine Basalt
Hand Sample: Aphanitic, light gray alkalic olivine basalt. Sample contains abundant feldspar phenocrysts ranging in diameter from 0.1cm to 0.9cm in length. Phenocrysts are generally blocky in shape. Occasional vesicles throughout sample ranging in diameter from 0.05cm to 0.3cm.
Thin Section: Groundmass of plagioclase grains. Large plagioclase and feldspar phenocrysts are abundant throughout sample. Some vesicles present in thin section.
Sample collected January, 1969
Western Minerals
HA-10
Alkalic Olivine Basalt
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.
Sample collected January, 1969
Western Minerals
HA-9
Oceanite
Hand Sample: Aphanitic dark gray vesicular oceanite with phaneritic olivine crystals. Olivine crystals are scattered throughout the sample and are either growing in clusters or as a single crystal. Olivine crystals range in diameter from 0.1cm to 0.8cm. Vesicles are very predominant, and range from 0.01 cm to 1 cm in diameter
Thin Section: Aphanitic groundmass of plagioclase, interstitial glass, and microcrystals of clinopyroxene. Phenocrysts of olivine, pyroxene, amphiboles, and plagioclase are present. Vesicles are roughly ~.01mm in diameter and present throughout the sample.
Sample collected January, 1969
Western Minerals
HA-8
Tholeiitic Olivine Basalt
Hand Sample: Aphanitic medium gray vesicular basalt with scattered olivine crystals. Olivine crystals are scattered throughout the sample and are either growing in clusters or as single crystals. Olivine crystals range in size from 0.05cm to 0.5cm in diameter. Vesicles are common in sample and range in diameter from 0.05cm to 2cm.
Thin Section: Aphanitic groundmass of plagioclase, interstitial glass, and microcrystals of clinopyroxene. Phenocrysts of olivine and pyroxenes are present in the picture. Vesicles are large but not as numerous as phenocrysts.
Sample collected January, 1969
Western Minerals
HA-7
Iridescent Pahoehoe
Hand Sample: Dark gray, vesicular, glassy sample. Sample surface has a ropey texture with vesicles ranging from 0.01cm to 2.5cm in diameter. Sample has an iridescent luster on unweathered surfaces.
Thin Section: Aphanitic opaque groundmass with phenocrysts of amphiboles, plagioclase, and olivine. Vesicles are abundant throughout thin section.
Sample collected January, 1969
Western Minerals
HA-6
Pumice
Hand Sample: Glassy, dark gray, vesicular pumice. The sample contains many small pieces of the pumice, ranging from 0.03cm to 1.5cm in diameter. Chunks of glassy pumice and volcanic ash compose sample.
No Thin Sections of this sample
Sample collected January, 1969
Western Minerals
HA-5
Basaltic Spatter
Hand Sample: On cut face, aphanitic, gray basalt with light colored phaneritic crystals (~0.1 cm in size). Subparallel fractures noted across sample. Exterior of sample has been heavily weathered, resulting in the red and orange discoloration.
Thin Section: Groundmass of aphanitic plagioclase. Some larger plagioclase grains are found throughout the sample in addition to some olivine phenocrysts. Vesicles are present throughout sample.
Sample collected January, 1969
Western Minerals
HA-4
Volcanic Bomb
Hand Sample: Imperfect volcanic bomb. Aphanitic with reddish brown color. Observed mudcrack texture of surface likely formed due to weathering. Sample contains abundant vesicles (< 0.05cm in size).
Thin Section: Opaque groundmass with numerous vesicles. Phenocrysts of amphiboles are present.
Sample collected January, 1969
Western Minerals
HA-3
Tholeiitic Basalt
Hand Sample: Apahanitic vesicular dark gray-black basalt. Larger (<0.05cm), light-colored crystals are visible throughout the sample. Shape of crystals ranges from elongated to square shape. Vesicles size range from 0.01cm to 0.05 cm, and have an elongated, thin shape.
Thin Section: Groundmass of aphanitic plagioclase with interstitial glass. Phenocrysts of olivine and plagioclase crystals. Numerous vesicles are present throughout thin section.
Sample collected January, 1969
Western Minerals
HA-2
Tholeiitic Basalt
Hand Sample: Aphanitic vesicular dark gray-black basalt. Sample contains numerous vesicles ranging in size from 0.01cm to 1.5 cm.
Thin Section: Groundmass of aphanitic plagioclase. Plagioclase grains vary in size with some larger grains throughout sample. Numerous vesicles are present throughout thin section.
Sample collected January, 1969
Western Minerals
HA-1
Volcanic Phenomena Suite - The Hawiian Islands of Hawaii and Oahu, Western Minerals Supplementary Information
OCR RPD of supplemental information for the Volcanic Phenomena Suite - The Hawaiian Islands of Hawaii and Oahu
Western Minerals, Inc
January 20, 1969
HA-suite