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Pyrrhotite With Siderite & Quartz

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QRI751001

Pyrrhotite With Siderite & Quartz

Classic Locality

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 6.7 × 2.5 cm
Largest Crystal: 
1.20cm
Weight: 
155.00gr
Description

Sizeable specimen of pyrrhotite from Morro Velho, featuring perfectly shaped platy groups, with fresh metallic luster. The main pyrrhotite is a platy aggregate of hexagons, approx 1.2 cm in max size, which appears to be a twinned group. The other crystals - dozens of them - are all in the range of 5 mm size, with mostly curvy surface and quite fresh lustre. All pyrrhotite crystals have an excellent brassy color and metallic lustre.
The contrast between the species is excellent, as the pyrrhotite is grown in the midst of white calcite and yellow siderite - all displaying good luster. The carbonates feature occasional transparency, especially at the tips of the crystals. In the middle of the specimen, a long colorless quartz crystal lays among the carbonates, giving a further aesthetic touch to this specimen.
In these kind of specimens it is often possible to spot small brassy cubanite crystals - not clearly detected on this one (not analysed).

Very rich and aesthetic oldtimer from this renowned Brazilian locality, difficult to find nowadays in good quality. The specimen is certainly a couple decades old. A lucky find at the Munich Show 2019.

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

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Quartz

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

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