Kal'tsiotantit CaTa4O11-novyy mineral iz granitnykh pegmatitov Kol'skogo poluostrova  [Calciotantite, a new mineral from the granitic pegmatites of Kola Peninsula]

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Alternate Title:Calciotantite, a new mineral from the granitic pegmatites of Kola Peninsula
Authors:Voloshin, A. V.; Pakhomovskiy, Ya. A.; Tyusheva, F. N.
Author Affiliations:Primary:
Akad. nauk SSSR, Geol. inst. kol'sk. fil., Apatity, USSR
Volume Title:Mineralogicheskiy Zhurnal
Source:Mineralogicheskiy Zhurnal, 4(3), p.75-79. Publisher: Akademiya Nauk Ukrainy, Kiev, USSR. ISSN: 0204-3548
Publication Date:1982
Note:In Russian with English summary. 3 refs.; illus. incl. 1 anal., 3 tables
Summary:Calciotantite has been found only as inclusions in microlite; this occurs associated with other Ta-Nb minerals, apatite and scheelite in granitic pegmatites. It forms isometric crystals and is colourless and transparent; lustre adamantine; cleavage absent; microhardness 970 (40 g) and 1200 (20 g) kg/mm2. In reflected light it has a pronounced anisotropy; reflectance 486 nm 16.9, 16.3; 551 nm 17.0, 16.6; 589 nm 17.1, 16.7; 656 nm 18.2, 18.0%. The XRD pattern is analogous to that of synthetic CaTa4O11 and calciotantite is thus hexagonal, space group P63 or P63/m; it has a 0.623, c 1.222 nm; Z = 2, Dcalc. 7.46 g/cm3; strongest lines 0.302(10), 0.1508(10), 0.278(9) nm. Microprobe analysis gave Ta2O5 91.09, Nb2O5 2.84, CaO 6.05, Na2O 0.05, Fe2O3 0.00, = 100.03, leading to the idealized formula CaTa4O11. [R.A.H.]
Subjects:Alkaline earth metals; Calcium; Economic geology; Geochemistry; Granites; Granitic composition; Igneous rocks; Metals; Mineral data; Mineralogy; Minerals; New minerals; Oxides; Pegmatite; Plutonic rocks; Tantalum; Commonwealth of Independent States; Europe; Fennoscandia; Kola Peninsula; Russian Federation; Russian Fennoscandia; Russian Platform; USSR; Calciotantite; Russian Republic
Abstract Numbers:83M/0750
Record ID:1985060324
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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