... columbite occurs with rare W-rich ixiolite, qitianlingite, pyrochlores, and scheelite in some varieties of zinnwaldite granite. In the uppermost part of the cupola, Ta-rich cassiterite, microlite and pyrochlore are frequently observed. The greisens host predominantly wolframite, scheelite and Ta-poor...

... (beryl, chrysoberyl, bertrandite, euclase, trilithionite, Li-muscovite, petalite, pollucite), rare element-bearing oxide minerals (columbite-tantalite, bismutotantalite, Nb-rutile, cassiterite, hübnerite, qitianlingite), phosphate minerals (triplite, lithiophilite, Mn-rich apatite, xenotime, monazite...

...Fig. 7 Habitus de la qitianlingite. (a) Cartographie élémentaire au MEB montrant les cristaux mixtes de qitianlingite-manganocolumbite (violets), wolframite (blanc-gris) et scheelite (gris sombre avec les impacts de laser pour datation ICPMS) ; (b) Cartographie élémentaire au MEB du grand cristal...

...Fig. 12. The crystal structure of lithiotantite (left) and the proposed structure of qitianlingite (right). ...

... ~ 56% Microlite (Mic) (Na,Ca) 2 Ta 2 O 6 (F,OH) Ta 2 O 5 ~ 82% Qitianlingite (Qit) (Fe,Mn) 2 (Nb,Ta) 2 WO 10 Nb 2 O 5 ~ 31.1% Ta 2 O 5 ~ 8.5% Li-bearing Spodumene (Spd) LiAl(Si 2 O 6 ) Li 2 O ~ 6.9% Petalite (Ptl) Li(AlSi 4 O 10 ) Li 2 O ~ 4.7% Eucryptite (Ecp) Li(AlSiO 4...

... other questionable and insufficiently studied minerals [ qitianlingite , yttrocolumbite -( Y ), yttrotantalite -( Y ), yttrocrasite -( Y )] and one ungrouped species [lithiotantite] in the general stoichiometry M O 2 – crystal structures based on the hexagonal close packing of anions, the six-fold...

... sulphide minerals. Topaz in the greisens contains up to 30 to 40 vol.% of a varied suite of fluid and mineral inclusions, including quartz, albite, K-feldspar, zinnwaldite, muscovite, columbite, apatite, zircon, ilmenorutile, qitianlingite [(Fe,Mn) 2 (Nb,Ta) 2 WO 10 ] and varlamoffite [(Sn,Fe)(O,OH) 2...

... , 469 – 475 (in Russ.). Yang , Guangming , Wang , Su , Peng , Zhizhong & Bu , Jingzhen ( 1985 ): Qitianlingite – a newly discovered superstructure complex oxide . Acta Mineral. Sinica 5 , 193 – 198 (in Chinese). In the columbite quadrilateral, the rutile matrix...

... Stibiotantalite Stibiocolumbite Tungstibite Qitianlingite Koragoite Billwiseite Formula SbTaO 4 SbNbO 4 Sb 2 WO 4 Fe 2 (Nb,Ta) 2 WO 10 MnNb 2 (Nb,Ta) 3 W 2 O 20 Sb 5 Nb 3 WO 18 Symmetry Orthorhombic Orthorhombic Orthorhombic Orthorhombic Monoclinic Monoclinic Space group Pc 2...

..., colum = columbite, ferg = fergusonite-(Y), fl = fluorite, ilm = ilmenite, Kfsp = potassic feldspar, mgt = magnetite, moly = molybdenite, monaz = monazite, musc = muscovite, n.a. = no data available, plag = plagioclase, qtn = qitianlingite, thor = thorite, thoria = thorianite, tpz = topaz, uranothor...