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Chalcopyrite On Sphalerite

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SCH541984

Chalcopyrite On Sphalerite

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Description
Locality: 
Ballard Mine, Baxter Springs, Picher Field, Cherokee County, Kansas, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
10.3 × 9 × 6.8 cm
Description

Parallel brown sphalerite crystals to 42 mm with epitaxial (oriented to underlying mineral structure) overgrowth of brassy chalcopyrite crystals to 1-2 mm resulting in reflections off the chalcopyrite simultaneously when illuminated from certain angles. Hard to photograph specimen, must be seen in person to be appreciated.

Mineral Data
What's on the rock

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0
schani

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