Alekseev, and two co-authors, reported in 2011 that the finding of wolframoixiolite with inclusions of niobian ferberite is described from zinnwaldite granite and ongonite of the Severny pluton of the Chukchi Peninsula. The optical, morphological, and chemical properties of minerals are characterized and compared with their analogues from other regions. The petrologic and mineragenic index implications of the minerals are discussed with allowance for our contemporary mineralogical knowledge on W-bearing Ta–Nb minerals.
Accessory wolframoixiolite was found for the first time in zinnwaldite granitic rocks of the Chaun region of the Chukchi Peninsula. The presented data, along with the results of other contemporary studies of wolframoixiolite, refute the opinion about its polyphase composition. Although the wolframoixiolite from the Chukchi Peninsula contains ferberite inclusions, it is distinguished by its individuality in crystal morphology and chemical composition and most likely is a homogeneous metastable variety of ixiolite. Its origin is related to the crystallization of an ongonitic melt enriched in Nb, Ta, and W with the formation of the late members of the rare-metal granitic series, including Li–F granite, ongonite, and pegmatite. Wolframoixiolite and the accompanying niobian ferberite can be regarded as index minerals of rare-metal magmatism.
Alekeev, et al., also examined wolframoixiolite in lithium-fluoric granites of the Arga-Ynnakh-Khaysky massif, Yakutia (here).
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