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Durangite

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MGR745922

Durangite

Rare Mineral

Description Tabs

Description
Locality: 
Thomas Range, Juab County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 0.9 × 0.8 cm
Description

Even at the type-locality (Durnago, Mexico) this is a very rare mineral, even more rare from Utah. And the particular specimen is the very best durangite I ever saw - there is a really huge (for durangite) exposed at the top of dark hematite matrix. The crystal is free-standing and raise up vertically. An exceptional specimen for this very rare mineral, that exists only on 5 localities world-wide!

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