Little Lake Perlite deposits, Sugarloaf Mountain, Coso Mining District, Coso Mountains, Inyo County, California
Miniature - 4.4 x 3.6 x 2.9 cm
32 grams
Specimen status: Available
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Vesicles in a dark obsidian matrix host
partial balls of off white, grainy cristobalite (no
distinct crystals are seen). In one cristobalite cavity we
see numerous small blades of dark fayalite. These need
magnification for best appreciation. Cristobalite is a
quartz polymorph - SiO2 , whereas
fayalite is an iron nesosilicate - Fe2+ 2 SiO 4 .
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