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Fluorannite: KFe++3AlSi3O10F2
Comments: Blue crystal of fluorannite on matrix. Location: Katugin Ta-Nb deposit (Katuginskoye deposit), Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Crystal Size 4 mm. © Sergey Vasiliev / Systematic Mineralogy