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Cristobalite Fayalite & Obsidian

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FNW48827

Cristobalite Fayalite & Obsidian

Description Tabs

Description
Locality: 
Cougar Butte, Cascade Range, Siskiyou County, California, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
2.1 × 5.4 × 1.6 cm
Description

White hemispherical cristobalite crystal formations to 1.2 cm in diameter in highly lustrous obsidian crystal. The formation has some gemmy, brown, fayalite crystals. The spheres of cristobalite were created by devitrification (loss of silica) of the obsidian.

Mineral Data
What's on the rock

Cristobalite

Formula: 
SiO2
Strunz: 
4.DA.15
Crystal System: 
Tetragonal - Trapezohedral
Hardness: 
6.0 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

Fayalite

Formula: 
Fe2+2SiO4
Strunz: 
9.AC.05
Crystal System: 
Orthorhombic
Hardness: 
7.0
Type Locality: 
Faial Island (Fayal Island), Azores District, Portugal
Fine Minerals World