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Bixbyite & Tridymite

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CLB632670

Bixbyite & Tridymite

Classic Locality

Description Tabs

Description
Locality: 
Thomas Range, Juab County, Utah, United States of America
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10.3 × 7.3 × 3.5 cm
Description

Four glossy black bixbyite crystals with one twinned on matrix with some tiny colorless and transparent tridymite crystals. There are traces of a blue mineral I couldn't identify.

Mineral Data
What's on the rock

Bixbyite

Formula: 
Mn3+2O3
Strunz: 
4.CB.10
Hardness: 
6.0 - 6.5
Colour: 
Black
Streak: 
Black
Type Locality: 
Maynard's claim (Pismire Knolls), Thomas Range, Juab Co., Utah, USA...

Tridymite

Formula: 
SiO2
Strunz: 
4.DA.10
Crystal System: 
Triclinic - Pedial
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

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