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Topaz & Opal

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CFL729097

Topaz & Opal

Description Tabs

Description
Locality: 
Thomas Range, Juab County, Utah, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.3 × 0.8 cm
Weight: 
20.00gr
Description

Rare specimen of gemmy topaz crystal associated with colorless gemmy opal.

Mineral Data
What's on the rock

Topaz

Formula: 
Al2(SiO4)(F,OH)2
Strunz: 
9.AF.35
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
8.0
Streak: 
White

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White

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