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Topaz With Opal-AN

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PDM946412

Topaz With Opal-AN

Description Tabs

Description
Locality: 
Villa García Municipality, Zacatecas, Mexico
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 3.3 × 2.5 cm
Description

Block of white porous rhyolite rock with a cavity where red coloured topaz crystals have grown freely. The main crystal is a text book, perfectly terminated topaz, of very intense vitreous lustre with an attractive red colour. Free of damages it is formed by the prism {110}, modified by {120}, bevelled by {010} and (001) at the top. Far better on the hand, it displays great cause it is mounted on a socle. Under short UV illumination it is evidenced that the glassy bubbles the cover part of the crystal top are opal-AN, showing a strong green fluorescence.

Ex Roger Gnat collection.

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-AN

Variety Of: 

Opal

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

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