... 1.04 Mn 0.70 Cu 0.15 Co 0.11 ) Σ2.00 [AsO 4 ] 2 [AsO 2 (OH) 2 ]. * E-mail: akampf@nhm.org 17 10 2016 19 2 2017 © 2017 The Mineralogical Society 2017 magnesiocanutite new mineral canutite arsenate alluaudite group crystal structure Torrecillas mine Iquique...

..., shows canutite to be isostructural with protonated members of the alluaudite group. * E-mail: akampf@nhm.org 1 1 2014 9 3 2014 © 2014 The Mineralogical Society 2014 canutite new mineral crystal structure alluaudite group Torrecillas mine Chile O ur...

... member of the alluaudite group. Its structure is based upon chains of edge-sharing octahedra running along [−101] and linked by T (2)O 4 tetrahedra into layers parallel to (010). The layers are further interlinked through T (1)O 4 tetrahedra to form a three-dimensional octahedral-tetrahedral framework...

... and is a member of the alluaudite group; it is the first alluaudite-group mineral with an acid phosphate group. The new mineral is named in honor of Lee A. Groat, Professor of Mineralogy at the University of British Columbia in Vancouver. The species and the name groatite were approved by the Commission on New...

...André-Mathieu Fransolet; Frédéric Hatert; François Fontan Abstract A sample from the Kibingo granitic pegmatite, Rwanda, shows a striking assemblage of an alluaudite-group mineral with heterosite. The core of alluaudite s.l. is strongly pleochroic in blue green to pinkish grey hues...

... or As. Synthetic members of the group demonstrate much broader chemical variability. Over the past 20 years many synthetic alluaudite-type phosphates, arsenates, and molybdates have been reported ( e.g. Rondeux & Hatert, 2010 ; Stojanović et al., 2012). In synthetic materials the monovalent cations may...

... Mount Wills Granite. The phosphates include members of the arrojadite, alluaudite and jahnsite–whiteite groups, most commonly forming fine-grained intergrowths that have replaced primary phases such as triplite, wolfeite and presumed triphylite. Electron microprobe analysis has enabled...

...-member (space group C2/ c, Z = 4, a = 12.018(2), b = 12.565(3), c = 6.415(1) Å, β = 114.33(3)°), a synthetic compound with a chemical composition corresponding to the idealized composition of the Buranga alluaudite, was carried out to R 1 = 0.026. The following cationic distribution was observed: Na...

...Fig. 7 The different types of end-member formulae existing in the alluaudite group. ...

... ) =0.09 for 1250 symmetry independent reflections. The crystal parameters are a 12.004(2), b 12.533(4), c 6.404(1) Å, β3 = 114.4(1)°, space group C2 / c , cell contents approximately Na 2.5 Li 0.1 Ca 0.5 Mn 2+ 4.5 Mg 0.2 Fe 3+ 7.9 (PO 4 ) 12.0 The alluaudite structure type involves four distinct larger...

.... Beusite has primary inclusions of Mg-rich phosphates, one belonging to the alluaudite group and the other one possibly belonging to the triplite or wolfeite groups. Breakdown of beusite under oxidizing hydrothermal conditions produced, among others, mitridatite and jahnsite-(CaMnMg). § E-mail...

... is a variant of the johillerite structure, which belongs to the alluaudite group. The mineral is the first example of a hydrated mineral from this group. e-mail: halil.sarp@mhn.ville-ge.ch 29 11 2004 24 02 2004 04 08 2004 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart...

... alluaudite-group minerals, surrounded by eight O-atoms with a < A (2)–O> distance of 2.70 Å, and occupied by Na plus small amounts of other large cations. The refined site-scattering values and observed < M –O> distances at the M (1) and M (2) sites are in accord with occupancy primarily by Mg...

.... This assignment is confirmed by the excellent correlations between the average ionic radius of the cations occurring on the M sites, and the energy of the absorption band. Phosphates of the alluaudite group occur as accessory minerals in granitic pegmatites, particularly in the beryl-columbite-phosphate...

...Natalia N. Koshlyakova; Natalia V. Zubkova; Igor V. Pekov; Gerald Giester; Evgeny G. Sidorov Abstract Johillerite, an anhydrous arsenate member of the alluaudite group with the idealized crystal chemical formula A (2) Na A (1) Cu M Mg 3 ( T AsO 4 ) 3 , is an abundant mineral in the exhalations...

... fumaroles. Nineteen fumarolic arsenates with Cu 2+ , Al, Fe 3+ or Ti contain additional O 2− anions. The major fumarolic arsenates at Tolbachik are alluaudite-group members (johillerite, calciojohillerite, nickenichite, bradaczekite and badalovite), lammerite, svabite, tilasite, berzeliite and urusovite...

... in the outer zone of phosphate nodules, where it is associated with fluorapatite, wolfeite, Ca-rich graftonite and alluaudite-group minerals. Maneckiite is transparent, dark brown, with a colourless streak and vitreous lustre, brittle, and has a good cleavage //{010}, a splintery fracture and a Mohs hardness...