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Amethyst With Calcite

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KGM1059225

Amethyst With Calcite

Description Tabs

Description
Locality: 
Alto Uruguay, Tiradentes do Sul, Rio Grande do Sul, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 8.2 × 5.7 cm
Description

A brilliant piece of Amethyst geode from Iraí, Rio Grande do Sul in Brazil. The specimen consists of an Amethyst druse sitting on a banded Agate that’s covering a little bit of green matrix. The Amethyst shows some outstanding transparency and a brilliant luster, as well as some deep violet coloration. In between some Amethyst crystals, there’s Calcite needles and columns peeking through, with microscopic secondary Calcite crystallization, giving the big crystals a bit of sugary, satin luster and milky appearance. 

The specimen is in very good condition, with some damaged Calcite columns.

Mineral Data
What's on the rock

Amethyst

Variety Of: 

Quartz

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

Calcite

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

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