Bismutomicrolite (of Zalashkova & Kukharchik 1957)
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A mineral from the Altai Mountains, Russia first described as a variety of microlite and named as "bismutomicrolite" by Zalashkova & Kukharchik (1957). The mineral has the composition (Na0.94Ca0.83Bi0.08Al0.06Fe0.02)Ta2O6[F0.58(OH)0.34O0.08], the A position is mainly occupied by Na, and the Y position, mainly by F, and correspond to fluornatromicrolite (Witzke et. al 2011).