...T. Baikie; M. Schreyer; F. Wei; J. S. Herrin; C. Ferraris; F. Brink; J. Topolska; R. O. Piltz; J. Price; T. J. White Abstract Lead-containing (Pb- B - X )-2 H apatites encompass a number of [ A F ] 4 [ A T ] 6 [( B O 4 ) 6 ] X 2 compounds used for waste stabilization, environmental catalysis...

...Tom Baikie; Martin K. Schreyer; Chui Ling Wong; Stevin S. Pramana; Wim T. Klooster; Cristiano Ferraris; Garry J. McIntyre; T.J. White Abstract A gem-grade apatite from Brazil of general composition (Ca,Na) 10 [(P,Si,S)O 4 ] 6 (F,Cl,OH) 2 has been studied using single-crystal X-ray and neutron...

... and we found no evidence for lower symmetry in our study. Actually, in the apatite supergroup only 57% of the chemical end-members adopt the space group P 6 3 / m , the others crystallizing in hexagonal subgroups, or in monoclinic or triclinic space groups ( White et al. 2005 ; Baikie et al. 2007...

... (1968) . A crystal structure refinement of svabite was never carried out. The only available structural data are for synthetic Ca 5 (AsO 4 ) 3 F ( Baikie et al. 2007 ). As understanding the atomic arrangements of As-rich apatite minerals would help to better refine their utility in environmental...

... provided a full crystal structure determination for ganomalite from Jacobsberg, Sweden, which confirmed the findings of Dunn et al. (1985) . More recently, Baikie et al. (2010) presented a formal description of apatite polysomes with the general formula A 5 N B 3 N O 9 N +6 X N δ (2 ≤ N...

...-hedenbergite series. Baikie et al. ( 2014 ) investigate the relationship between the Pb 2+ stereoactive lone pair and the twist angle in Pb-dominant apatite supergroup minerals and show that the apatite framework is remarkably flexible. Colombo et al. ( 2014 ) describe the crystal structure...

... flexibility of the corner-connected A1-BO 4 framework that circumscribes the one-dimensional tunnels containing the A2-X components. Whereas the prototype structure has hexagonal symmetry ( P 6 3 / m ), ordering and/or distortions can reduce symmetry to monoclinic or triclinic in some examples ( Baikie et al...

... to the tetrahedral angle of 109.5°. Note that the chosen As-O bond length matches the mean values found in chloro-arsenate apatite (1.682 Å; Wordojo and Hwu, 1996 ) and mimetite (1.693 Å; Dai et al ., 1991 ; Baikie et al ., 2008 ). The distances between the tetrahedrally coordinated O atoms and the hydroxyl O...

... : Agard Ph. Aghazadeh M. Amthauer G. Andreozzi G. * Angiboust S. * Anguilano L. Asimow P.D. Atencio D. Audétat A. Bacik P. Baikie Th. Balan E. Baldwin J.A. Ballirano P. * Banerjee D. Barakin V. Belluso E. Belogub E.V. Bente K. Berryman E...

... (rusinovite) is a member of the polysomatic apatite group ( Baikie et al ., 2010 ). In nasonite ( Fig. 6 ), trigonal prisms of CaO 6 build face-sharing columns along the hexagonal c axis. Laterally, these columns are connected to a channel by Si 2 O 7 groups, aligned parallel to the c axis. The centre...

... and medium Au suites (JFR(l) and JFR(m), respectively), Crocket (1990) ; and an Ni-Cu massive sulfide from the Baikie showing in the Archean Florence Lake Group, Central Labrador (BS), Brace and Wilton (1990) . ...

... triangles of O1 and O2, which twist to form these metaprisms ( White and ZhiLi 2003 ; White et al. 2005 ; Baikie et al. 2007 ). The twist angle between these O 2– triangles can be related to compositional effects ( Dong and White 2004a , 2004b ; Baikie et al. 2007 ). Our data at ambient pressure...

.... Although the symmetry of apatites is typically hexagonal (space group P 6 3 / m ), several phases have been reported with lower symmetry (e.g., White et al. 2005 ; Baikie et al. 2007 ), sometimes showing superstructure reflections (e.g., Chakhmouradian and Medici 2005). This is particularly true for Cl...

..., Andreas Austrheim, H. Bachmann, O. Bacon, C. Baikie, T. Baker, L.L. Balan, E. Ballhaus, C. Barbarand, J. Barker, S. Barnes, J. Barnes, S. Bassett, W.A. Baumgartner, L.P. Becker, U. Beckett, J.R. Bell, A.S. Benzerara, K. Bergantz, G. Berger...

... financially by DFG DE 412/45-1, a Russian President grant (MK-1645.2009.5) and a Russian Federal Programme Scientific Cadres for Innovative Russia (state contract # 02.740.11.0326). References Baikie , T. , Ferraris , C. , Klooster , W.T. , Madhavi , S. , Pramana , S.S. , Pring...

... travelers in Africa by showing where they died, their nationality, and their occupation ( Figure 2 ). When comparing the map of Duveyrier with the map of Welwitsch, the matching names are: Alexandrine Petronella Francina Tinné (1835–1869), William Balfour Baikie (1824–1864), Bain Hugh Clapperton (1788–1827...

... ) is isostructural with other “ordinary” apatites. Dong and White (2004) reported monoclinic distortion and space group P 2 1 / m for Ca 10 (VO 4 ) 6 (F 0.90 O 0.05 ☐ 0.05 ) 2 . Baikie et al. (2007) determined space group P 1 for Ca 5 (VO 4 ) 3 F in which the symmetry lowering is caused by the tilting of VO...

... for the TG–DTA– MS measurements. Robert F. Martin is thanked for his careful editorial comments, which have greatly improved the flow of the manuscript. References Baikie , T. , Ferraris , C. , Klooster , W.T. , Madhavi , S. , Pramana , S.S. , Pring , A. , Schmidt , G...

... and the different preference of Pb over Ca in occupying the cationic position, as well as the presence of a free electron pair on the Pb 2+ ion ( Kim et al. 2000 ; Baikie et al. 2014 ), the mechanism and magnitude of substitution may be different. Exchange of REE 3+ for Ca 2+ requires a coupled substitution...