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Goethite Psm Iron Cross Pyrite

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RRW799026

Goethite Psm Iron Cross Pyrite

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Description
Locality: 
Gachalá Municipality, Guavió-Guatéque District, Cundinamarca Department, Colombia
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3 × 3 cm
Largest Crystal: 
3.00cm
Weight: 
64.00gr
Description

A rare and very fine "Iron Cross" twinned pyrite from the renowned find a few years ago.  The twin is formed by the right angle intersection of two pentagonal dodecahedra.  Iron cross twins are quite uncommon, and are rarely found in large complete crystals such as this.  This has a thin surface veneer of Goethite, but is essentially solid Pyrite.  This crystal is in top condition for the find, as most had some nicks and edge wear from being in the soil. The twinning on this is outstanding.

 

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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