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Quartz Psm Anhydrite

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SNJ87088

Quartz Psm Anhydrite

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Description
Locality: 
Silverton, Animas, San Juan County, Colorado, United States of America
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 5.5 × 3.4 cm
Description

Quite an attractive and interesting quartz after anhydrite encrustation.

The San Juan Mountains are known for exceptional epimorphs and these are some of the better ones. Originally, such pieces were thought to be barite encrustations but recent taesting shows them to be quartz after anhydrite.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Anhydrite

Formula: 
CaSO4
Strunz: 
7.AD.30
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 3.5
Type Locality: 
Salt mine, Hall valley, Hall, Innsbruck, Inn valley, North Tyrol, Tyrol, Austria
sanjuanmtnrocks
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