... analogue of montgomeryite. The name honours Luca Fanfani who structurally characterised many phosphate minerals including montgomeryite. Corresponding author, e-mail: [email protected] 28 02 2019 12 04 2019 16 04 2019 © 2019 E. Schweizerbart’sche Verlagsbuchhandlung, 70176...

...Pete J. Dunn; Joel D. Grice; William C. Metropolis Abstract Zodacite is a new Mn-dominant member of the montgomeryite group. Microprobe analysis yielded MgO 0.2, MnO 4.8, CaO 18.0, A1 2 O 3 7.7, Fe 2 O 3 14.1, P 2 O 5 34.8, H 2 O (by difference) 20.4, total = 100.0 wt%. The idealized formula is Ca...

...L. Fanfani; A. Nunzi; P. F. Zanazzi; A. R. Zanzari Abstract An independent structural study on montgomeryite confirms the general features previously reported by Moore and Araki (1974). However the presence of several weak h 0 I reflections with l odd shows that the symmetry of the mineral...

... dark blue, Y light brown, Z dark brown (Hesnard). Olmsteadite contains the same kind of structural unit as found in montgomeryite and vauxite. It consists of corner-linked octahedral chains of composition [ Fe 2 2+ ( Nb,Ta ) 2 5+ O 4 ( H 2 O ) 4 ( PO 4 ) 4 ] 6− which are oriented parallel to [010...

...Paul Brian Moore; Takaharu Araki Abstract Montgomeryite, Ca 4 Mg(H 2 O) 12 [A1 4 (OH) 4 PO 4 O 6 ], Z = 2, a 10.023(1), b 24.121(3), c 6.243(1)Å, β 91.55(1)°, space group C 2/ c , possesses chains of corner-linked Al-O octahedra which are topologically and geometrically equivalent to the chains...

... contains 2[Ca 3 Al 8 (PO 4 ) 8 (OH) 6 ·15H 2 O]. The mineral is named after Mr. Edwin Over of Colorado Springs, Colorado. Montgomeryite , Ca 4 Al 5 (PO 4 ) 6 (OH) 5 ·11H 2 O, is a new mineral from cavities in the variscite nodules of Fairfield, Utah. It is monoclinic and occurs as green to colorless lath...

... -centred monoclinic cells and general formula Ca 4 A 2+ B 3+ 4 (PO 4 ) 6 (OH) 4 ·12H 2 O, where A and B = Mg and Fe for calcioferrite, Mg and Al for montgomeryite, Mn and Fe for zodacite and Mn and Al for fanfaniite, together with the triclinic mineral kingsmountite, Ca 3 Mn 2+ Fe 2+ Al 4 (PO 4 ) 6 (OH) 4...

...{document} \({\bar{1}}\) \end{document} 0; 5.73, (23), 101, 230 and 111; 8.01, (21), 130. Angastonite is likely to be related to the montgomeryite-group members and have a similar crystal structure, based on slabs of phosphate tetrahedra and Al octahedra. The original samples of angastonite were collected...

...Fig. 1. Radial fans of whiteite-(CaMgMg) blades with montgomeryite (lower left). The FOV is 1.7 mm across. ...

... structure is more closely related to those of vauxite and montgomeryite in containing zig-zag strings of corner-connected Al-centred octahedra along [011], where the shared corners are alternately in cis and trans configuration. These chains link through corner-sharing with PO 4 tetrahedra along [001...

... as crandallite in the few remaining bones, and as montgomeryite with traces of crandallite in the surrounding sediments. Bones within the pocket have very high levels of Al, Fe, F and Zn and often have "diffusive" type U-shaped concentration profiles. These profiles show that post-mortem uptake of trace elements...

... in beryl along with roscherite, montgomeryite, robertsite, mitridatite, whitlockite, and englishite. It occurs as colorless to white spear-shaped blades up to 0.4 × 0.1 × 0.04 mm, as sheaf- and bow tie–like aggregates, and as compact radial sprays to 2 mm in diameter. Individual crystals are flattened...

... in the formation of crandallite and wavellite (low phosphate concentration) or montgomeryite (high phosphate concentration). Phosphatization of argillaceous sediments will invariably lead to the formation of millisite and taranakite, and may involve palmerite as an intermediate phase. Variscite is unstable...

...; these are, in their probable sequence, gordonite, englishite, montgomeryite, overite, and sterrettite. The third stage represents the deposition of a small amount of pseudowavellite, and the fourth, the deposition of the members of the apatite group. Each of these stages has characteristic chemical qualities. The variscite...

.... F ig . 2. Higher-magnification BSE view of the whiteite laths in Fig. 1 a showing compositional zoning. The structural identity with kingsmountite and montgomeryite ( Moore and Araki, 1974 a ) was confirmed by a powder XRD pattern. Mücke ( 1981 ) reported a Mn-bearing kingsmountite...