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Pyrrhotite Dolomite & Quartz

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NST730562

Pyrrhotite Dolomite & Quartz

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
16 × 11 × 7 cm
Largest Crystal: 
3.30cm
Description

A 3.3 cm Rock crystal sitting dominantly between sharp beige Dolomite rhombs and several Pyrrhotites.

Mineral Data
What's on the rock

Pyrrhotite

Formula: 
Fe1-xS (x = 0 to 0.17)
Strunz: 
2.CC.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Quartz

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