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Goethite On Quartz

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PJM83825

Goethite On Quartz

Ex J & S Mommers Collection

Description Tabs

Description
Locality: 
Tichka Massif, Asni Cercle, Al Haouz Province, Marrakesh-Safi Region, Morocco
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 3 × 1.6 cm
Description

Black sprays of gorthite, translucent red at the edges splash out over a bed of gemmy quartz crystals. Centred in this specimen is a pair of quartz crystals with secondary overgrowth.

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White
Earthstones Australia

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