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Cristobalite In Obsidian

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PDM1019234

Cristobalite In Obsidian

Description Tabs

Description
Locality: 
Black Rock Desert, Millard County, Utah, United States of America
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.3 × 4.7 × 3.7 cm
Weight: 
146.00gr
Description

A good size obsidian rock (a vitreous volcanic glass) that forms when molten lava erupts on to the surface of the Earth and cools quickly. This snowflake obsidian from the Black Rock desert is of late Tertiary age. The white flakes of cristobalite in this snowflake obsidian form when glass devitrified with time and crystallize. A representative hand size specimen, it is and Ex H.Cremers specimen.

Combine specimens to reduce shipping costs!.

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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