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Durangite & Cassiterite

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BCK161599

Durangite & Cassiterite

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Description
Locality: 
Topaz Mountain, Thomas Range, Juab County, Utah, United States of America
Size Range: 
Thumbnail (1-3cm)
Size: 
1.9 × 0.9 × 1.3 cm
Description

A small matrix specimen with several crystals of durangite among tiny red cassiterite and unusual hematite crystals.

Mineral Data
What's on the rock

Durangite

Formula: 
NaAl(AsO4)F
Strunz: 
8.BH.10
Hardness: 
5.5
Type Locality: 
Barranca Mine, Coneto de Comonfort, Mun. de Coneto de Comonfort, Durango, Mexico

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0

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