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Goethite Psm Gypsum

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PDM671938

Goethite Psm Gypsum

Pseudomorph

Description Tabs

Description
Locality: 
Lavrion District Mines, Attiki Prefecture, Greece
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.3 × 5 × 2.7 cm
Description

A black lustrous botryoidal crust of goethite epimorphic after gypsum. Representative specimen for the locality.

Even if the specimen was collected in 1989 by Paul Van Wassenhoven, there is no record of the specific mine where it was found, just “Lavrion”.

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

Gypsum

Formula: 
CaSO4·2H2O
Strunz: 
7.CD.40
Hardness: 
2.0
Streak: 
White.

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