Investment Quality Olkusz Schalenblende: Polished Banded Zn-Pb-Fe Sulfide from a Classic Locality

Olkusz Schalenblende Masterpiece: Polished Banded Sphalerite, Galena & Marcasite Slice

Size:  52 gram

Weight: 44mm x 40mm x 7mm

Origin:  Olkusz Mine, Southern Poland

This exceptional specimen is an investment-quality polished slice of "Schalenblende" from the renowned Olkusz Mine in Southern Poland. It showcases captivating concentric banding in shades of creamy yellow to rich brown, characteristic of sphalerite and wurtzite, beautifully contrasted by lustrous silvery galena and darker, often iridescent, marcasite. The front surface has been meticulously polished to a high shine, revealing its intricate patterns, while the reverse retains its natural, raw mineral texture.  

"Schalenblende," a German term meaning "shell ore," refers to a distinctive, compact, and fine-grained aggregate of sulfide minerals. It is primarily composed of sphalerite (often with its hexagonal polymorph, wurtzite), marcasite, and galena, characterized by its prominent concentric layering and reniform (kidney-shaped) surfaces.  

This remarkable formation is believed to have originated from the relatively rapid, low-temperature crystallization of a sulfide gel or colloidal dispersion, often referred to as "ore mud." The rhythmic banding reflects episodic precipitation. Marcasite typically forms the outermost layers, indicating its precipitation at a final stage of primary ore mineralization, while galena often appears to have infiltrated later, cutting across and cementing previously deposited bands.  

While its constituent minerals are common, Olkusz Schalenblende is considered a very rare and highly prized occurrence globally, celebrated for its top quality and unique concentric shapes. Specimens from Olkusz are particularly valued as a classic locality for these unique formations. This mineral also offers valuable insights into Mississippi Valley-Type (MVT) ore genesis and can even be fluorescent under UV light, adding to its collector appeal.

Secure this investment-quality Olkusz Schalenblende slice for your collection today a true geological masterpiece!

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