Günterblassite, Apatite, Magnetite
Feuerberg, Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Perfect günterblassite crystals from Feuerberg volcano. See the exact form of edges.
EDX by G.Blaß: 1.1 At% Mg, 16.7% Al, 64.7% Si, 7.4% K, 5%Ca, 1.3% Ba, 3.9% Fe
Because of Fe>Mg it's günterblassite.
The needles are thin apatites togehter with idiomorphic magnetite.
Found & collection by Karl Leu, photo © 2022 by Volker Heck, [image ...