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Goethite With Calcite

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TBM826116

Goethite With Calcite

Classic Locality

Description Tabs

Description
Locality: 
Montevecchio Mines, Medio Campidano Province, Sardinia, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
10.5 × 7.5 × 6 cm
Weight: 
291.00gr
Description

Cluster of numerous arborescent Goethite growths up to 8 mm heigh partially covered by lenticular calcite crystals grouped in rosettes.

Mineral Data
What's on the rock

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany

Calcite

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