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Ankerite

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NSS503552

Ankerite

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Description
Locality: 
Governador Valadares, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 6 × 5 cm
Largest Crystal: 
6.00cm
Description

complete rhombohedral  terminated without chipping. I bought for ankerite,have IR very high, max 1.710 dolomite have max  1.681 , compatible for ankerite but I'm not sure it could be ferroan dolomite.

Mineral Data
What's on the rock

Ankerite

Formula: 
Ca(Fe2+,Mg)(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Styrian Erzberg, Eisenerz, Styria, Austria

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