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Hejtmanite, a manganese-dominant analogue of bafertisite, a new mineral

Stanislav Vrana, Milan Rieder and Mickey Gunter
Hejtmanite, a manganese-dominant analogue of bafertisite, a new mineral
European Journal of Mineralogy (February 1992) 4 (1): 35-43


Hetjmanite forms prismatic or platy crystals <= 1 mm long enclosed in manganoan arfvedsonite veins in foliated alkali granite and syenite at Mbolwe Hill, Mkushi River area, Central Province, Zambia. EPMA gave SiO (sub 2) 23.52, TiO (sub 2) 13.27, Nb (sub 2) O (sub 5) 1.4, Al (sub 2) O (sub 3) 0.37, FeO (sub tot) 11.29, MnO 14.12, MgO 0.13, BaO 30.2, Na (sub 2) O 0.06, K (sub 2) O 0.30, F 3.3, Cl < 0.1, H (sub 2) O 1.86 = 98.43, leading to the idealized formula Ba(Mn,Fe) (sub 2) TiO(Si (sub 2) O (sub 7) )(OH,F) (sub 2) . It is brownish yellow to golden yellow, transparent and pleochroic with alpha (light green-yellow) 1.814, beta (dark golden yellow) 1.846, gamma (light yellow) 1.867, 2V (sub alpha) 76.4 degrees, gamma:a 15.9 degrees ; perfect cleavage 100. Indexed XRD powder data are tabulated; strongest lines 2.726(100), 5.472(32), 3.241 + 3.215(21), 3.455(17), 2.180(16) Angstrom ; a 11.748, b 13.768, c 10.698 Angstrom, beta 112.27 degrees ; diffraction symbol A*/*; isotypic with bafertisite; D 4.016 g/cm (super 3) ; the IR absorption spectrum is presented. The name is for B. Hejtman, Emeritus Professor of Petrology, Charles University, Prague, and it is proposed that it be used for the Mn (super 2+) > Fe (super 2+) members of the solid solution with bafertisite. Analyses are also reported for the host manganoan (MnO approx 5%) arfvedsonite.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 1
Title: Hejtmanite, a manganese-dominant analogue of bafertisite, a new mineral
Affiliation: Geol. Surv., Prague, Czechoslovakia
Pages: 35-43
Published: 199202
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 17
Accession Number: 1993-025707
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, 7 anals.
S17°00'00" - S08°00'00", E22°00'00" - E33°30'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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