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Calcite On Mottramite

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SMS1155968

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Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 3.8 × 2.6 cm
Weight: 
48.02gr
Description

Sporadic crystals of calcite have been deposited over mottramite. The crystals of calcite with bevelled edges have grown over the mottramite and partially included. The mottramite is botryoidal as well as arborescent. A couple of the calcite crystals are not perfect.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Aragonite and Vaterite
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Mottramite

Formula: 
PbCu(VO4)(OH)
Strunz: 
8.BH.40
Hardness: 
3.0 - 3.5
Type Locality: 
Mottram St Andrew, Cheshire, England, UK

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