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Guilleminite & Demesmaekerite

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AMM1051705

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Description
Locality: 
Musonoi Mine, Kolwezi, Lualaba, DR Congo
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 2.8 × 2.4 cm
Description

Excellent specimen with two rare and well-formed minerals. The specimen is richly decorated with intensive yellow guilleminite crystals high in contrast to green malachite. In association with a deep bottle-green demesmaekerite (nearly black because of the huge crystal-aggregate) which is not (!) dehydrated. Specimen in very good condition.  

Type locality specimen for both minerals. Guilleminite is only known from four localities and demesmaekerite is only known from three localities. High quality specimen.

From the collection of Luc VANDENBERGHE, longtime mindat member and famous Belgian u-mineral collector. Specimen of a very well kept collection.

Mineral Data
What's on the rock

Guilleminite

Formula: 
Ba(UO2)3(SeO3)2(OH)4·3H2O
Strunz: 
4.JJ.10
Crystal System: 
Orthorhombic
Hardness: 
2.0 - 0.0
Type Locality: 
Musonoi Mine, Kolwezi, Kolwezi District, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)

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)

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