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Goethite Psm Gypsum & Limonite

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PFK693705

Goethite Psm Gypsum & Limonite

Classic Locality

Description Tabs

Description
Locality: 
Hilarion Mine, Hilarion, Kamariza, Agios Konstantinos, Lavrion District, Attiki Prefecture, Greece
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
14.4 × 4 × 4 cm
Description

A striking pseudomorph of goethite after a prismatic crystal of gypsum. One side of the piece is covered with orange-brown limonite while the other side that shows the pseudo nicely, is an almost black goethite. A fine, well-sized and well-formed example of this impressive kind of encrustation pseudomorph from 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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