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Calcite On Sepiolite

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PDM686209

Calcite On Sepiolite

Description Tabs

Description
Locality: 
Victoria Mining Group, San Blas-Canillejas, Madrid, Madrid, Spain
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10.4 × 8 × 5 cm
Largest Crystal: 
1.00cm
Description

Transparent modified rhombohedral crystals of calcite on a mass of white sepiolite. Self-collected in the mine during a visit on October 2003.

This group of Mines extract the biggest sepiolite deposit in the world, but this kind of specimens is rarely represented in collections even in Spain.

Mineral Data
What's on the rock

Calcite

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

Sepiolite

Formula: 
Mg4(Si6O15)(OH)2·6H2O
Strunz: 
9.EE.25
Hardness: 
2.0
Streak: 
White
Type Locality: 
Bettolino, Baldissero Canavese, Canavese District, Torino Province, Piedmont, Italy

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