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Posnjakite

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QRI683120

Posnjakite

Rare Mineral

Description Tabs

Description
Locality: 
Badín, Banská Bystrica County, Banská Bystrica Region, Slovakia (Slovak Republic)
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
6.2 × 10.8 × 6.4 cm
Description

Rich group of secondaries from this classic European locality. Elongated posnjakite crystals occupy a shallow vug on matrix, mostly filling it in a beautiful group of fans. Associated, a number of devilline crystals populate a good portion of the main face. Possibly other blue secondaries (spangolite?) are present as well, although I have not been able to identify them properly.
Excellent color contrast. These secondaries are quite sought after because of their aesthetic appeal. Acquired at the Munich show in 2006.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Posnjakite

Formula: 
Cu4(SO4)(OH)6·H2O
Strunz: 
7.DD.10
Crystal System: 
Monoclinic
Hardness: 
2.0 - 3.0
Type Locality: 
Nura-Taldy W deposit, Karagandy Province (Qaragandy Oblysy; Karaganda Oblast'), Kazakhstan...

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