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Bismutomicrolite: (Bi,Ca)(Ta,Nb)2O6(OH)
Comments: A dark crystal of bismutomicrolite in pearly muscovite. Location: Malkhan Range, Krasny Chikoy, Chitinskaya Oblast', Transbaikalia, Eastern-Siberian Region, Russia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag