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Quartz & Dumortierite

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MGR747194

Quartz & Dumortierite

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Description
Locality: 
Vaca Morta Quarry, Serra da Vereda, Boquira, Bahia, Brazil
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.8 × 2.4 × 2.1 cm
Description

I saw only a fist full of these specimen at the Munich show - and selected only this one. The other crystals were not lustrous, all faces were powdered with dumotierite. This particular piece is lustrous at the front and water-clear inside - the blue color is a dumotierite layer at the backside. Very rare and very eye-catching material! No significant damages to report.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Dumortierite

Formula: 
(Al,Fe3+)7(SiO4)3(BO3)O3
Strunz: 
9.AJ.10
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 8.0
Type Locality: 
Ducarre's Quarry, Beaunant, Chaponost, Rhône, Rhône-Alpes, France...
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