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Siderite & Goethite

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MGR591675

Siderite & Goethite

Description Tabs

Description
Locality: 
Peyreblanque Mine, Alban - Le Fraysse, Tarn, Occitanie, France
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 8 × 4.8 cm
Description

This is very rare material out of an old collection. The crystals formed spherical aggregates, partly covered by brownish layer. The edges of all these blades are razor sharp terminated and the assemble is very tri-dimensional. Hard to photograph, much better in person. No significant damages to report.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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