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Cristobalite

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MGR748470

Cristobalite

Rare Mineral

Description Tabs

Description
Locality: 
Thomas Range, Juab County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.9 × 4.5 × 3.4 cm
Description

The typlocality is San Cristobal in Mexico, but this one is from the well known locality in Utah, mined in 1998 and represents a extreme rare variety of Quartz. It is a high-temperature modification and only come to exist over 1470°C. This is an out-standing rarity, found at only a fist full localities and only in low number.

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