Quartz

specimen number:
2133376

location:
Kallenhardt, Sauerland, Nordrhein-Westfalen, Germany

description:
A cluster of colorless double terminated quartz crystals. In good condition.

The Kallenhardt quarry, located near the town of Warstein within the northern Sauerland region of North Rhine-Westphalia, Germany, is a major active open-pit industrial operation primarily dedicated to extracting devonian limestone. Geologically, the quarry cuts deep into the massive, reef-born Massenkalk limestone formations of the Givetian and Frasnian stages, which underwent intense structural fracturing and karstification during the Variscan orogeny. These tectonic fractures and dissolution cavities served as conduits for low-temperature hydrothermal fluids that precipitated distinct, doubly terminated quartz crystals, which often exhibit characteristic clay inclusions and iron oxide phantom layers. Industrial-scale stone quarrying at the Kallenhardt site has been continuously managed by corporate operators like Westkalk since the mid-twentieth century to supply high-purity limestone for chemical, agricultural, and construction industries, with extraction activities remaining fully operational today while simultaneously exposing new mineralized fissure zones for scientific study.

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