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Topaz & Opal

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CFL773484

Topaz & Opal

Description Tabs

Description
Locality: 
San Luis Potosi, Mexico
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 1.7 × 1.6 cm
Description

Very nice specimen of a translucent red brown topaz crystal, with sharp termination, associated with highly fluorescent hyalite opal.  Comes with label.  Ex-Roland Bouhelier specimen.

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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