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Cristobalite

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UVM785411

Cristobalite

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Description
Locality: 
Ajo, Little Ajo Mountains, Ajo District, Pima County, Arizona, United States of America
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 1.3 × 1.3 cm
Description

A nice marble like cristobalite nodule from a little known locality, Marble Mountain near Ajo.   Collected by Jim Thomas, a long time mining engineer at the New Cornelia Mine.

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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