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Graphite Pyrrhotite & Pyrite

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MCH634719

Graphite Pyrrhotite & Pyrite

Description Tabs

Description
Locality: 
Dabmutsuokaddas, Karasjok, Troms og Finnmark, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.4 × 3 × 1.5 cm
Description

A split 3 cm diameter drillcore from a borehole drilled at a remote locality in Lapland in Northern Norway: A bronze coloured matrix of pyrrhotite hosts black fragments of graphite that are mostly quite angular and have sometimes a narrow rim and crack fillings of pyrite. In the matrix also some higher reflecting pyrite crystals can be observerd that are often altered to brownish gossan. There are a very few very small red spots of hematite, too. The drill core is matt laquered in order to show better its filigreed structures. A very interesting and attractive specimen.

Mineral Data
What's on the rock

Graphite

Formula: 
C
Strunz: 
1.CB.05a
Crystal System: 
Hexagonal
Hardness: 
1.0 - 2.0

Pyrrhotite

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

Pyrite

Formula: 
FeS2
Strunz: 
2.EB.05a
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5

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