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Sphalerite with Galena & Marcasite

#49928

Sphalerite with Galena & Marcasite

#49928
Availability
Sold
Size
10 x 6 x 1 cm - Cabinet 
Formula
ZnS (RRUFF)
Locality
Olkusz mine, Olkusz dist., Malopolskie, Poland
Tagged
sulfide

This form of Sphalerite is also known as "schalenblende". There are terrific photos on the Mindat page in which the schalenblende is described well. Basically the concentric zones of deposition vary in color and grain size and seen in the photos as light brownish yellow to dark brown rings. The outer margin is mostly Marcasite. Galena later infiltrated the host as seen by silvery blobs cutting all layers of former deposition.

Sphalerite

Formula
ZnS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular, Colloform 
Cleavage
Perfect, Perfect, Perfect 
Luster
Resinous - Greasy 
Color
brown, yellow, red, green, black 
Streak
brownish white 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Robert J. Waidler Collection

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