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Cristobalite In Obsidian

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CLB149939

Cristobalite In Obsidian

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Description
Locality: 
Cougar Butte, Cascade Range, Siskiyou County, California, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.7 × 4.9 × 4 cm
Description

Very nice crystobalite ball in jet-black 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

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