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Mansfieldite Smolyaninovite & Heterogenite

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BCK152124

Mansfieldite Smolyaninovite & Heterogenite

William Henderson collection
Rare Mineral

Description Tabs

Description
Locality: 
Mount Cobalt Mine, Selwyn District, Cloncurry Shire, Queensland, Australia
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 1.4 × 1.3 cm
Description

A small matrix specimen with numerous clusters of cobaltian mansfieldite with feathery brown smolianinovite, black heterogenite and minor fibrous erythrite. Classic material from a classic collection.

Mineral Data
What's on the rock

Mansfieldite

Formula: 
AlAsO4·2H2O
Strunz: 
8.CD.10
Hardness: 
3.5 - 4.0
Type Locality: 
Hobart Butte, Black Butte District, Lane Co., Oregon, USA

Smolyaninovite

Formula: 
(Co,Ni,Mg,Ca)3(Fe3+,Al)2(AsO4)4·11H2O
Strunz: 
8.CH.55
Crystal System: 
Orthorhombic
Hardness: 
2.0
Colour: 
Yellow
Type Locality: 
Khovu-Aksy Ni-Co deposit, Tuva Republic, Eastern-Siberian Region, Russia

Heterogenite

Formula: 
CoO(OH)
Strunz: 
4.FE.20
Crystal System: 
Trigonal
Hardness: 
3.0 - 5.0
Type Locality: 
Wolfgang Maaßen Mine field, Schneeberg District, Erzgebirge, Saxony, Germany

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