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Calcite With Duftite & Conichalcite

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KMF559309

Calcite With Duftite & Conichalcite

Classic Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 6 × 3 cm
Description

A striking contrast of high luster, texture and rich color from tsumeb from the Mcavoy mineral collection and comes with the original label. The substantial size makes the specimen more attractive revealing significant mineralized zones that feature the association of the two minerals as well as each on its own.

The calcite is present as sharp colorless clear rhombs that are in some areas included with dark green duftite which occurs in two distinct crystal habits both botryoidal and drusy are present. The close-up images reveal some minor bright green spheres that I assume is conichalcite??. There must have been repeated duftite mineralization since it is present within and on the calcite.

The two highly mineralized zones on either side of the central calcite band clearly indicate the natural orientation of the specimen as it occurred insitu since the duftite could only have settled selectively on exposed surfaces covering those significantly leaving all hidden areas clean.

This specimen is in a superb condition with only attachment related contacts to be found on the periphery.

 

 

 

Mineral Data
What's on the rock

Calcite

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

Duftite

Formula: 
PbCu(AsO4)(OH)
Strunz: 
8.BH.35
Crystal System: 
Orthorhombic
Hardness: 
4.5
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Conichalcite

Formula: 
CaCu(AsO4)(OH)
Strunz: 
8.BH.35
Crystal System: 
Orthorhombic
Hardness: 
4.5
Type Locality: 
Hinojosa del Duque, Córdoba, Andalusia, Spain
Labels
Label Images - only: Calcite With Duftite & Conichalcite

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