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Tikhonenkovite: SrAl(OH)F4·(H2O)
Comments: Colorless tikhonenkovite grain. Location: Karasug Fe-REE-barite-fluorite Deposit, Tannu-Ola Range, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Grain length 1.8 mm. © Thomas Witzke / Abraxas-Verlag