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bobfergusonite group

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Journal Article
Published: 01 June 2004
The Canadian Mineralogist (2004) 42 (3): 705-716.
... moitié remplis par le Na. Dans tous les membres du groupe de l’alluaudite, les sites M forment des groupes trimériques linéaires d’octaèdres à arêtes partagées, et les structures de l’alluaudite, la wyllieïte et la bobfergusonite possèdent des degrés d’ordre et désordre subtilement différents...
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Journal Article
Published: 01 December 2010
The Canadian Mineralogist (2010) 48 (6): 1455-1463.
... of cations in the anion framework of this structure type gives rise to superstructures: wyllieite-group minerals ( Moore & Ito 1973 , Moore & Molin-Case 1974 , Hatert et al. 2005 , 2006b ), and bobfergusonite ( Ercit et al . 1986a , 1986b , Tait et al . 2004 ). During a systematic...
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Journal Article
Published: 01 September 2005
European Journal of Mineralogy (2005) 17 (5): 741-747.
... varieties with Mn 2+ in M (2a) octahedron remained open for future discoveries. Later on found bobfergusonite ( Ercit et al. , 1986 ) with Mn 2+ in M (2a) position closed this niche of unnamed mineral. One more representative of the group with M (2a) site occupied by Mg 2+ cations got the name...
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Journal Article
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 807-810.
..., and bertrandite), dumortierite-supergroup minerals (including holtite group and szklaryite), and a variable assemblage of Mn phosphates: triphylite- and graftonite-groups, bobfergusonite, parafiniukite and pieczkaite. The pegmatite mineral assemblage displays a very high extent of Mn-Fe fractionation...
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Patterns of cation order in the alluaudite-<b>group</b> ( sensu lato ) structures:...
Published: 01 June 2004
F ig . 7. Patterns of cation order in the alluaudite-group ( sensu lato ) structures: (a) alluaudite with complete disorder; (b) alluaudite with complete order; (c) wyllieite with Al ordered at M (2b) and M 2+ + Fe 3+ disordered over M (1) and M (2a); (d) wyllieite with Al ordered at M
Journal Article
Published: 01 October 2007
The Canadian Mineralogist (2007) 45 (5): 1307-1324.
...Joseph A. Mandarino Abstract The Gladstone–Dale relationship allows one to derive a compatibility index of the physical and chemical data used to characterize a mineral. Minerals of the following groups are reviewed: carbonates, sulfates, phosphates, vanadates, vanadium oxysalts, chromates...
Journal Article
Published: 01 June 2004
The Canadian Mineralogist (2004) 42 (3): 717-722.
... 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...
FIGURES
Journal Article
Published: 01 October 2009
The Canadian Mineralogist (2009) 47 (5): 1213-1223.
...Miguel Angel Galliski; Julio C. Oyarzábal; Maria Florencia Márquez-Zavalía; Ron Chapman Abstract Qingheiite, the Mg end-member of the wyllieite group of transition-metal phosphates, with a formula Na 2 MnMgAl(PO 4 ) 3 and known so far only from the type locality, was discovered in a new...
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Journal Article
Published: 01 August 2002
The Canadian Mineralogist (2002) 40 (4): 1207-1210.
... of the crystals is slightly richer in Fe than the rim. The mineral is uniaxial (+), with all n greater than 2.30 ( n calc is 2.38 at 589 nm); D obs 6.66 g/cm 3 , D calc 6.67 g/cm 3 . It is isostructural with ferrotapiolite, with a 4.668(2), c 9.269(6) Å (from powder-diffraction data), space group P 4 2 / mnm...
FIGURES
Journal Article
Published: 01 July 2000
European Journal of Mineralogy (2000) 12 (4): 847-857.
...-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...
FIGURES
Journal Article
Published: 01 July 2019
European Journal of Mineralogy (2019) 31 (4): 807-822.
... (2a)– M (2b) and X (1a)– X (1b) in wyllieite, as well as a change of space group. The structural formula of wyllieite-type phosphates corresponds to X (2) X (1a) 0.5 X(1b) 0.5 M(1) M (2a) M (2b)(PO 4 ) 3 . More recently, Ercit et al. (1986a, b) described bobfergusonite, □Na 2 Mn 5 Fe 3+ Al(PO 4...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1555-1571.
.... 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...
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Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1047-1052.
... is hexagonal, space group P 6 3 / m , a = 9.504(4), c = 6.347(3) Å, V = 496.5(1) Å 3 , Z = 2, c : a = 1:0.6678. The six strongest lines in the X-ray powder diffraction pattern are as follows: d (Å), I , ( hkl ): 2.794, 100, (2̄31, 1̄31); 2.744, 88, (030); 2.639, 34, (1̄22); 2.514, 25, (031, 022); 1.853, 25...
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Journal Article
Published: 01 January 2013
European Journal of Mineralogy (2013) 25 (1): 113-115.
..., especially for grandfathered species. Well-established mineral names or names dedicated to localities or persons have to be preserved, except if the species is shown to be not valid. Historical names cannot be changed in order to standardize the nomenclature of a group or supergroup, since mixed nomenclature...
Journal Article
Published: 01 September 2018
The Canadian Mineralogist (2018) 56 (5): 853-856.
...,Ta,Ti) oxides (wodginite group, tantalite), phosphates (amblygonite–montebrasite, triphylite–lithiophilite), micas, and the aluminosilicates of lithium and their breakdown products. He regularly published results on the Tanco pegmatite as a running series in The Canadian Mineralogist , and thus...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1441-1444.
... is clearly an ongoing one, to judge from contributions in this issue. He studied, in cooperation with his colleagues and students, almost all minerals from the Tanco pegmatite, namely the (Nb,Ta,Ti) oxides (wodginite group, tantalite), phosphates (amblygonite–montebrasite, triphylite–lithiophilite), micas...
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Journal Article
Published: 01 February 2003
The Canadian Mineralogist (2003) 41 (1): 71-77.
... for the alluaudite structure is conformable with the space group P 2 1 / c for the wyllieite structure, and P 2 1 / n for the bobfergusonite structure ( Ercit et al. 1986a , b ). Alternatively, one could adopt the C 2/ c orientation in alluaudite, and then wyllieite and bobfergusonite would become P 2 1...
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Journal Article
Published: 07 August 2018
Mineralogical Magazine (2018) 82 (4): 1015-1021.
...; Mineralogical Magazine , 82 , 1015–1021. Alluaudite supergroup A new classification and nomenclature scheme has been approved for the minerals of the alluaudite supergroup. The supergroup is divided into the alluaudite group, the wyllieite group, and the bobfergusonite group. Discreditation...
Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 877-882.
... A new classification and nomenclature scheme has been approved for the minerals of the alluaudite supergroup. The supergroup is divided into the alluaudite group, the wyllieite group, and the bobfergusonite group. As a side effect of the new classification of alluaudites, the mineral fupingqiuite...
Journal Article
Published: 01 October 2011
The Canadian Mineralogist (2011) 49 (5): 1221-1242.
... the crystal structure of manitobaite and discuss its crystal-chemical relations with the other structure types of the alluaudite group sensu lato : alluaudite, rosemaryite and bobfergusonite. X-ray-diffraction data for green (brown) crystals of manitobaite from the type specimen were collected with Mo...
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