(with thanks to Günter Blass, Eschweiler)
I didn't know what mineral it was, and first I even didn't noticed it at all, I was focused on the Corundum crystals in the same specimen. Later I showed it to Günter Blass .... could be Spinel, he said, to be certain, let's analyse it. The EDX result: 9% Fe, 4% Zn, 45% Al, 7% Na, 2% K, 15% Mg, 18% S.
A Spinel i.e.S, a mixed one with Fe and Zn. I have just a tiny specimen with a few Spinel crystals, together with some Corundum crystals, Biotite, Nepheline, Sodalite and Pseudobrookite. Spinel is the third mineral from the "Spinel group" you cand find at the Wannenköpfe. The other ones are Magnetite and Magnesioferrite, both also very rare.
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