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Galena Pyrite Quartz Calcite

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RBR1054020

Galena Pyrite Quartz Calcite

Description Tabs

Description
Locality: 
Gyudyurska, Erma Reka, Madan, Smolyan Oblast, Bulgaria
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 7.5 × 3 cm
Description

The Gyudyurska deposit is one of the less know locations in Bulgaria. In a period about 35 years ago, this mine produced some characteristic specimens that are different from Madan for example. This specimen shows a wonderful combination of galena and pyrite. The contrast of these two minerals is excellent. Some of the galena-faces are covered by micro crystallized quartz as thin white layers. Also, there are some small calcite-balls as nice aggregations in the specimen’s center.

Mineral Data
What's on the rock

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey

Pyrite

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

Quartz

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

Calcite

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

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