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Dolomite On Heterogenite With Olivenite

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SMS1086531

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Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 6.7 × 2.9 cm
Weight: 
128.17gr
Description

The specimen has pristine crystals of euhedral dolomite on matrix covering tiny balls of heterogenite with what looks to be tiny olivenite. All of the crystals are small the dolomite being the largest in almost clear lustrous slightly bent rhombs. The olivenite under the microscope reveal triangular planes and here and there elongated prismatic crystals, in a rich green colour. The heterogenite is made up of tiny black shiny spheres.

Mineral Data
What's on the rock

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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

Olivenite

Formula: 
Cu2(AsO4)(OH)
Strunz: 
8.BB.30
Crystal System: 
Orthorhombic
Hardness: 
3.0
Type Locality: 
Carharrack Mine, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

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