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Kroupaite & Compreignacite

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JYJ1022649

Kroupaite & Compreignacite

Description Tabs

Description
Locality: 
Johannes Evangelista Vein, Svornost Mine, Jáchymov, Krušné Hory, Karlovy Vary Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2.5 × 2 cm
Description

Yellow compreignacite with kroupaite from the Johannes Evangelista vein, Svornost, Jachymov, CZ.

Rare mineral. SEM-EDS & Raman confirmed no MA1580. 

 

Mineral Data
What's on the rock

Kroupaite

Formula: 
KPb0.5[(UO2)8O4(OH)10]·10H2O
Crystal System: 
Orthorhombic
Type Locality: 
Svornost Mine, Joachimstal, Bohemia, Czech Republic

Compreignacite

Formula: 
K2(UO2)6O4(OH)6·7H2O
Strunz: 
4.GB.05
Crystal System: 
Orthorhombic
Hardness: 
0.0
Type Locality: 
Margnac Mine, Compreignac, Haute-Vienne, Limousin, France