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Quartz On Calcite On Basalt

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SMS1040883

Quartz On Calcite On Basalt

Description Tabs

Description
Locality: 
Goboboseb Mountains, Brandberg, Dâures, Erongo Region, Namibia
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
4.8 × 9.1 × 5.2 cm
Weight: 
236.59gr
Description

The specimen consists of a hollow in basalt with a substantial growth of scalenohedral calcite representing a number of growth periods. The crystal habit is unusual for the locality. Numerous small crystals cover the sides of the space with one single elongate tower of scalenohedral crystals partly aligned in their growth but growing towards a large scalenohedral crystal. A very aesthetic specimen overall.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Calcite

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

Basalt

Variety Of: 

Igneous Rock

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