...Yamuna Singh; P. S. C. Pandit; Sanjay Bagora; P. K. Jain ABSTRACT Co-genetic pegmatites associated with the granite of the Kawadgaon area in the Bastar craton, Central India, contain a wide range of ore minerals of Nb, Ta, Be, Sn, Zr, Ti, and REE, including columbite-tantalite, ixiolite, pseudo...

... to as scandian columbite-tantalite and show degrees of structural order similar to columbite-tantalite lacking Sc. Disordered structures remain orthorhombic and become ordered upon heating. Pseudo-orthorhombic stannian (Sn-rich), titanian (Ti) and wolframian (W) variants of ixiolite may contain as much as 3.7 wt...

....% TiO 2 , and 17.21 wt.% FeO. TABLE 3. ELECTRON-MICROPROBE COMPOSITIONS OF ACHALAITE (SAMPLE CP-01-2) Wodginite-group minerals are monoclinic (space group C 2/ c ). Ixiolite is the disordered equivalent of wodginite, and is orthorhombic but becomes monoclinic on heating. “Pseudo...

.... ( 1972 ): The Tanco pegmatite at Bernic Lake, Manitoba. II. Wodginite, tantalite, pseudo-ixiolite and related minerals . Can. Mineral . 11 , 609 – 642 . Grice , J.D. , Ferguson , R.B. , & Hawthorne , F.C. ( 1976 ): The crystal structures of tantalite, ixiolite and wodginite...

... on the ‘ferropseudobrookite’–rutile join [Fpb(2) in the text]. Average compositions of the variants of ilmenite and of rutile also are shown. Also rarely encountered as inclusions in the ilmenite is an ixiolite-like phase. At Kalato, the material seems to be ‘pseudo-ixiolite’ in the sense of Černý and Ercit (1989...

...Petr Černý; Ron Chapman Abstract Niobian rutile commonly exsolves titanian ferrocolumbite to manganocolumbite or ixiolite with elevated contents of Nb, Mn and Sc, W or Sn, but further breakdown of the exsolved phase has not been reported to date. Niobian rutile from Eptevann, southern Norway...

... formula approaches ideal Sc(Nb,Ta)O 4 . Wise et al . (1998) mention an unpublished refinement of the structure of scandian ixiolite [with Ta >Nb according to Table 3 in the paper of Wise et al. ] from the Heftetjern locality, which indicates that the structure is highly disordered and pseudo...

... ) and nioboixiolite-(Mn 2+ ) (Chukanov et al ., 2023b ). Bands in the IR spectra of these minerals are poorly resolved because of mixed occupancies of cation sites. IR absorption in the range of 400–800 cm –1 is due to stretching vibrations of the M O 2 pseudo-framework ( M  = Nb, Fe 3+ , Ti, etc.). Taking...

..., tapiolite, pseudo-ixiolite, fersmite and beryl. Monazite, bastnaesite, hydroxyl-bastnaesite, kainosite, synchysite, tritomite, and britholite represent rare-earth minerals. Occasionally, bismutite and beyerite (calcium bismuth oxide carbonate) are also present in pegmatites. The U and Th minerals noted...

..., Manitoba. II. Wodginite, tantalite, pseudo-ixiolite and related minerals . Can. Mineral . 11 , 609 – 642 . Grice , J.D. , Ferguson , R.B. & Hawthorne , F.C. ( 1976 ): The crystal structures of tantalite, ixiolite and wodginite from Bernic Lake, Manitoba. I. Tantalite and ixiolite...

.... ( 1995 ): Compositional and structural systematics of the columbite group . Am. Mineral . 80 , 613 – 619 . Grice , J.D. , Černy , P. & Ferguson , R.B. ( 1972 ): The Tanco pegmatite at Bernic Lake, Manitoba. II. Wodginite, tantalite, pseudo-ixiolite and related minerals...

... to the formal charge at the T (2) site, and the end-member formulae according to the criteria of Hawthorne (2002) are listed. Armenite has been included here even though it is orthorhombic, as it is pseudo-hexagonal and has an orthorhombic superstructure. In the end-member compositions listed in Table 7...

.... and FERGUSON , R.B. , 1972 . The Tanco Pegmatite at Bernic Lake, Manitoba. II. Wodginite, tantalite, pseudo-ixiolite and related minerals . Canadian Mineralogist , 11 , p. 609 – 642 . HALL , R.S. and RIGG , D.M. , 1986 . Geology of the West Anticline Zone, Musselwhite prospect...

...-grained niobian rutile (R1) and of fine-grained intergrowths of niobian rutiles (R1+2+3) with ferrocolumbite (C) and extremely fine-grained ?pseudo-rutile + rutile (PR). Reflected light, oil immersion, crossed polars. (b) Identical subject, but back-scattered electron image. Rutile 1 at left side...

... . The current members of the milarite group are listed in Table 7 . Note that armenite is only pseudo-hexagonal and has an orthorhombic superstructure. In the end-member compositions listed in Table 7 , the C site (with a rank of 1) is the only site that is not occupied by two species in the set of end...

..., with minor oligoclase. Primary accessory minerals include beryl, spessartine, gadolinite-(Y), cassiterite, Sc-rich ixiolite, scandium-bearing pyrochlore-group minerals, and milarite. A late mineral assemblage encountered mainly in vugs and fractures comprises bertrandite, bohseite, bazzite, Sc-rich helvite...

... ixiolite, fersmite, cesian natrobistantite (or bismutomicrolite) ( Webber et al. 1997 , Beurlen et al. 2005 , Simmons & Weber 2008 , Rodrigues Soares et al. 2008 ). Fig. 1 Geological map of the Borborema Pegmatite Province (RN and PB) and the Eastern Brazilian Pegmatite Province (MG...

...) + ferrowodginite form grey-brown pseudo-octahedral crystals with microlite (PZ19) embedded in massive albite. Whitish milky prisms of beryl rimmed by a green vitreous and gemmy portion are hosted by a medium-to coarse-grained rock that represents the albitized pegmatite. The tourmaline crystals analyzed...

...) were measured for the gadolinite 112 reflection (when observed) to monitor recrystallization progress. Pseudo-Voight function was used to fit the diffraction maximum. Raman spectra were obtained for the thermally untreated samples from polished sections mounted on glass slides by means of a Horiba...