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Goethite

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PDM632857

Goethite

Description Tabs

Description
Locality: 
Tharsis, Huelva, Andalusia, Spain
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.7 × 4.8 × 3.3 cm
Description

Mass of black botryoidal goethite with good luster and purple and blue reflexes. It is almost a floater specimen with a small contact point where it was the matrix. From the classic Tharsis Mines in Rio Tinto, exploited already in Roman times.

Ex. J. Muizebelt specimen, bought in 1995.

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

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