“Stinkspat” Fluorite - Johannisschacht, Woelsendorf, Bayern, GermanyThe famous 1961 Joha
“Stinkspat” Fluorite - Johannisschacht, Woelsendorf, Bayern, GermanyThe famous 1961 Johannisschacht mine (now closed) produced typical, deep black-violet fluorite specimen - so called “Stinkspat” - a variety of fluorite that emits an odor of HF and ozone upon grinding due to the internal presence of free fluorine and calcium and the interaction of components with water upon grinding. -- source link
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