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Goethite Psm Psm Pyrite

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MGR820350

Goethite Psm Psm Pyrite

Floater

Description Tabs

Description
Locality: 
Guavió Municipality, Gachala, Cundinamarca Department, Colombia
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 3.6 × 3.5 cm
Description

Large, penetration twinned, pentagonal dodecahedron Pyrite crystal! These striated Pyrite crystals are excellent examples of "iron cross" twins. And this is not just a samle - it shows 6 ! "iron crosses" and also the dimension and the quality are exceptional.  The mahogany color of the crystals is due to surface alteration, probably to Goethite.

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