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Goethite Psm Siderite

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PJM89290

Goethite Psm Siderite

Ex J & S Mommers Collection.

Description Tabs

Description
Locality: 
St Gotthard Massif, Ticino, Switzerland
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.7 × 1.1 cm
Description

A bright chocolate brown stack of siderite crystals from the St Gottard Massif has been partly pseudomorphed by goethite along one side of a very bright cluster.

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

Siderite

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

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