Mineral Specimen and Product Inventory Search
- Olkusz mine, Olkusz dist., Malopolskie, Poland
- 10 x 6 x 1 cm - Cabinet
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.
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- W. Fork Mine, Reynolds Co., Missouri, United States
- 8.5 x 5 x 6 cm - Sm Cabinet
- Ore Minerals
Dark lustrous brown Sphalerite crystals to 3mm totally covering lumpy colloform growths of brassy Pyrite. Neat specimen!
The W. Fork Mine is located in the SE lead-district in Missouri and is also a Mississippi Valley Type deposit in the Viburnum Trend. According to a paper on the W. Fork Mine the presence of rapidly deposited, collorform ZnS and FeS is an indicator that the ore fluids which deposited the sulfides in the central zone were more saturated with respect to metal sulfides (email us for link to abstract if interested).