• Polyakovite-(Ce): Mineral information, data and localities.

    www.mindat.org/min-10397.html Polyakovite-(Ce) mineral data, information about Polyakovite-(Ce), its properties and worldwide locations. SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser! Log In Register.
  • Polyakovite-(Ce) Mineral Data

    webmineral.com/data/Polyakovite-%28Ce%29.shtml Polyakovite-(Ce) Comments: Black, pitchy, polyakovite-(Ce) crystal showing conchoidal surfaces so typical for this mineral.Green fluororichterite overgrowth is just visible. Measured radioactivity is 146µR/h. Location: Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia.Scale: Specimen size is 4.5x3x2.5 cm.
  • Delhuyarite-(Ce): Mineral information, data and localities.

    www.mindat.org/min-51415.html Delhuyarite-(Ce)has the same structural topology as chevkinite subgroup minerals, e.g. chevkinite-(Ce). It is the only mineral of the group with a significant content of W6+ = 0.89 apfu.In delhuyarite-(Ce), Mg is dominant at the M1 site as in polyakovite-(Ce); the composition of the M2, M3 and M4 sites is [(Fe 3+ 2W ], with M2 being 50% vacant.
  • Polyakovite-(Ce) Mineral Specimen For Sale

    www.dakotamatrix.com/products/17864/polyakovite-ce Polyakovite-(Ce) - A one locality mineral, black resinous mass, probably metamict. Crystal fragment to 2mm. . This and many more mineral specimens are available for sale at Dakota Matrix Minerals.
  • POLYAKOVITE-(Ce), (REE,Ca)4 (Mg,Fe2+) (Cr3+,Fe3+)2 (Ti,Nb ...

    pubs.geoscienceworld.org/.../polyakovite-ce-ree-ca-4-mg-fe2-cr3-fe3-2-ti-nb-2 Skip to Main Content. Close. Journals; Books; GeoRef. About GeoRef; GeoRef Advanced Search
  • POLYAKOVITE-(Ce), (REE,Ca) 2+ 3+ (Ti,Nb) Si O A NEW ...

    rruff.info/doclib/cm/vol39/CM39_1095.pdf Polyakovite-(Ce) is a sorosilicate of Cr3+, Ti4+, Fe2+ and REE3+, and the first titanosilicate where Cr 3+ is a species-forming element. In the crystal structure of polyakovite-(Ce), there are four octahedrally
  • Polyakovite-(Ce) mineral information and data

    www.dakotamatrix.com/mineralpedia/9212/polyakovite-ce (Ce,Ca) 4 MgCr 2 (Ti,Nb) 2 Si 4 O 22 Crystal System Monoclinic Crystal Habit Amorphous, Metamict, Euhedral Crystals Luster Resinous Color black Streak light brown Class Monoclinic - Prismatic Fracture Brittle - Conchoidal Hardness 5.5-6 WebMineral View Polyakovite-(Ce) Mindat View Polyakovite-(Ce)
  • (PDF) Polyakovite-(Ce), (REE,Ca)4 (Mg,Fe2+) (Cr3+,Fe3+)2 ...

    www.researchgate.net/.../250273464_Polyakovite-Ce_REECa4_MgFe2_Cr3Fe32_TiNb2_... The crystal structures of natural Nb-rich chevkinite-(Ce) from the Biraya rare-metal deposit, Russia, crystallizing in space groups C2/m and P2 1 /a, were solved and refined to R 1 = 0.03 and R 1 ...
  • Polyakovite-(Ce) - mineralogicalassociation.ca

    www.mineralogicalassociation.ca/doc/Polyakovite-Ce.pdf Polyakovite-(Ce) (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2Si4O22 MONOCLINIC Locality: Mine N97, Ilmen Natural Reserve, southern Urals, Russia (Lat. 55°01' N, Long. 11 ...
  • Polyakovite-(Ce) Image - Mineral

    webmineral.com/specimens/picshow.php Black, pitchy, polyakovite-(Ce) crystal showing conchoidal surfaces so typical for this mineral. Green fluororichterite overgrowth is just visible. Measured radioactivity is 146µR/h. Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia.