It was first discovered 1922. It is only found in Namibia in the Tsumeb Mine (Tsumcorp Mine), Tsumeb, Tsumeb District.
... the Col d'Aubisque[?]. Due to a flat tyre (according to Van Est himself), he slipped away and fell into a 70 m deep ravine. Miraculously, he survived the fall and had no ...
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