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Demesmaekerite & Chalcomenite On Selenian Digenite

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PDM882638

Demesmaekerite & Chalcomenite On Selenian Digenite

Description Tabs

Description
Locality: 
Musonoi Mine, Kolwezi, Lualaba, DR Congo
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.1 × 1.5 cm
Description

Sharp lustrous crystals of olive green demesmaekerite on a matrix that is very rich in blue chalcomenite and selenian-rich digenite. Digenite is a classic matrix for many radioactive species at Musonoi but crystallized digenite such as this is extremely rare.

Found before 1985. Ex Joseph Lhoest specimen.

Mineral Data
What's on the rock

Demesmaekerite

Formula: 
Pb2Cu5(UO2)2(SeO3)6(OH)6·2H2O
Strunz: 
4.JJ.20
Crystal System: 
Triclinic
Hardness: 
3.0 - 4.0
Type Locality: 
Musonoi Mine, Kolwezi, Kolwezi District, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)

Chalcomenite

Formula: 
CuSeO3·2H2O
Strunz: 
4.JH.05
Crystal System: 
Orthorhombic
Hardness: 
2.0 - 2.5
Type Locality: 
Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina

Selenian Digenite

Variety Of: 

Digenite

Formula: 
Cu9S5
Strunz: 
2.BA.10
Hardness: 
2.5 - 3.0

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