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Calcite

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BSM213596

Calcite

ex Allan Dean Collection

Description Tabs

Description
Locality: 
Bonsall Moor, Bonsall, Derbyshire, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
12.2 × 8.9 × 6.2 cm
Description

 An interesting specimen consisting of two large scalenohedral crystals and numerous small ones on a base of siltstone.

The dominant crystal, 10.5cms in length, is doubly terminated and twinned. in addition it shows at least two generations of growth.  The core consists of a sharp opaque twinned crystal intimately mixed with silt . Overgrowing this is a layer of translucent tan coloured calcite with a slightly etched surface but revealing an orientation in its formation. The other half of the crystal consists of a mass of tiny ound ended crystals.  The original crystal shows through as a phantom.

The specimen was collected in 1983.

Mineral Data
What's on the rock

Calcite

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

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