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Goethite Psm Pyrite

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QRI677702

Goethite Psm Pyrite

Denver show 2018
Pseudomorph

Description Tabs

Description
Locality: 
Pelican Point, Utah County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.6 × 5.1 × 5 cm
Largest Crystal: 
1.50cm
Description

Elegant pseudomorph of goethite after pyrite from this Utah locality. Goethite has completely replaced pyrite crystals, which have preserved their trigliph faces. The lustre, now given by goethite, is quite good and metallic.
Unusual locality. I had never seen this on the market. Acquired at the Denver show 2018. 

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

Pyrite

Formula: 
FeS2
Strunz: 
2.EB.05a
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5

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