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Anhydrite Calcite & Amethyst

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MGR706806

Anhydrite Calcite & Amethyst

Description Tabs

Description
Locality: 
Iraí, Rio Grande do Sul, Brazil
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10.5 × 9.3 × 6.3 cm
Description

The matrix formed bowl with sharp glossy amethyste crystals in the center. On the top - a rarity for the region - a well arranged, chisel-formed group of anhydrite crystals. And finally - as the dot on the "i" - sveral brownish calcite crystals are scattered all over. Anhydrite represents an outstandig rarity for Irain - and this one is even a very aesthetic combination with calcite and amethyste. No significant damages to report.

Mineral Data
What's on the rock

Anhydrite

Formula: 
CaSO4
Strunz: 
7.AD.30
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 3.5
Type Locality: 
Salt mine, Hall valley, Hall, Innsbruck, Inn valley, North Tyrol, Tyrol, Austria

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Amethyst

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Formula: 
SiO2
Hardness: 
0.0
Colour: 
Purple
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