...E. Sokolova; F. Cámara; F. C. Hawthorne; L. A. Pautov Abstract The crystal structure of hejtmanite, Ba 2 Mn 4 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F 2 , from Mbolve Hill, Mkushi River area, Central Province, Zambia (holotype material) has been refined on a twinned crystal to R 1 = 1.88% on the basis...

... block has the stereochemistry and topology of Group II where Ti (+ Nb) = 2 apfu . Bafertisite is the Fe 2+ -analogue of hejtmanite and is related to cámaraite ( Table 1 ). Single-crystal X-ray data for bafertisite from Kola were collected using a Bruker APEX II ULTRA three-circle diffractometer...

... Å, and (2) jinshajiangite, perraultite, surkhobite, bobshannonite, bafertisite, hejtmanite, and cámaraite have a C -centered Bravais lattice, and their a and b unit-cell parameters are equal to doubled minimal translations: ∼ 10.8 (= 2 t 1 ) and ∼ 14 (= 2 t 2 ) Å ( Tables 1 , 2 ). The obvious...

..., but differs from the IR spectra of the related minerals bafertisite and hejtmanite (Fig. 1 ). The presence in the IR spectra of distinct bands in the range 530–535 cm −1 , the absence of the band ~1056 cm −1 and the absence of splitting for the band of OH-stretching vibrations (~3590 cm −1 ) are diagnostic...

..., murmanite, epistolite, bafertisite, hejtmanite, innelite, lomonosovite, vuonnemite, quadruphite, polyphite and sobolevite, as a unique series of structures based on the TS block, and they emphasized the importance of the TS block as a basic structural unit. Later, this particular series was considered...

... (the perraultite structure-type); bafertisite and hejtmanite (bafertisite structure-type); and cámaraite (related to the perraultite and bafertisite structure-types) are presented in Table 1 . Six minerals (excluding cámaraite) have basic structures in accord with Sokolova & Cámara (2013) . Cámaraite has...

... rare-element deposit . International Conference Satpaev's Lecturing: Geology, minerageny and future trends of mineral resources development. Proceedings , Almaty , 248 – 258 . Vrána , S. , Rieder , M. and Gunter , M.E. ( 1992 ) Hejtmanite, a manganese-dominant analogue...

... and Zhang Peishan (1959) Ba 2 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F 2 Ba 2 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F 2 4 (14) Hejtmanite Vrána et al. (1992) Ba 2 Mn 4 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F 2 Ba 2 Mn 4 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F 2 4 (15) General formula (Si 2 O 7 ) 2 (TO 4 ) 2...

... to the Fe dominant of the latter mineral. Murmanite a (Na, □) 2 {(Na,Ti) 4 [Ti 2 (O,H 2 O) 4 Si 4 O 14 ](OH,F) 2 }•2H 2 O 11.70 P 1̅ Nèmeth et al. 2005 Bafertisite a Ba 2 {(Fe,Mn) 4 [Ti 2 O 2 (O,OH) 2 Si 4 O 14 ](O,OH) 2 } 11.73 Cm Guan et al. 1963 Hejtmanite a Ba 2 {(Mn...