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Goethite On Dolomite

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CAM149118

Goethite On Dolomite

With Antique Label
Classic Locality

Description Tabs

Description
Locality: 
Diepenlinchen Mine, Mausbach, Stolberg, Cologne, North Rhine - Westphalia, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 6 × 3.5 cm
Description

Highly lustrous limonite, most likely goethite, covering dolomite crystals.
This kind of "Brauneisenerz" specimens were more common in the classic Siegerland Mining District but very rare in the Stolberg area.
Old sample from pre-1919.

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

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White
Cartils Minerals

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