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1-20 OF 25 RESULTS FOR
kentrolite
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Journal Article
Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 April 2008
American Mineralogist (2008) 93 (4): 573–583.
...G. Dörsam; A. Liebscher; B. Wunder; G. Franz Abstract Synthetic crystals of melanotekite and kentrolite were obtained at 850 °C from melt. The aluminum analogue of kentrolite Pb 2 Al 2 Si 2 O 9 was hydrothermally synthesized at 2 GPa, 650 °C together with zoisite-(Pb) and margarite-(Pb). Synthesis...
Includes: Supplemental Content
Journal Article
The kentrolite-melanotekite series, 4 Pb 2 ( Mn,Fe ) 2 3 + + O 2 [ Si 2 O 7 ] : Chemical crystallographic relations, lone-pair splitting, and cation relation to 8URe 2
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 August 1991
American Mineralogist (1991) 76 (7-8): 1389–1399.
...Paul Brian Moore; Pradip K. Sen Gupta; Shen Jinchuan; Elmer O. Schlemper Abstract Members of the kentrolite-melanotekite series from L6ngban, Sweden, are orthorhombic holosymmetric, a = 6.961(2), b = 11.018(3), c : 9.964(5) Å, space group Pbcn (subgroup of Cmcm ), Z = 4, formula from Cameca probe...
Journal Article
New Data on Kentrolite and Melanotekite: Ternary Phase Relations in the System PbO-Fe 2 O 3 -SiO 2
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 August 1967
American Mineralogist (1967) 52 (7-8): 1085–1093.
... is orthorhombic, space group p *** , a = 6.97, b = 11.0, c = 9.83 Å. Kentrolite, 2PbO·Mn 2 O 3 ·2SiO 2 , is isostructural with melanotekite; a = 7.00, b = 11.0, c = 9.97 Å. Z = 4. Laboratory studies to determine the subsolidus compatibility triangles show that at 650°C, melanotekite can coexist with the following...
Image
Differences in octahedral chain in ( a ) kentrolite-(Al) compared to ( b ) ...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 7. Differences in octahedral chain in ( a ) kentrolite-(Al) compared to ( b ) kentrolite-(In). Octahedra chain in kentrolite-(Al) is stretched. Black dots represent Al1 and Al2 atoms in kentrolite-(Al), respectively, In1 and In2 atoms in Kentrolite-(In). Differences in M-octahedra
Image
Changes in lattice parameters as a function of ionic radii ( Shannon 1976 )...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 4. Changes in lattice parameters as a function of ionic radii ( Shannon 1976 ) of trivalent cations (Fe, Mn in high spin) on the M-positions in sixfold coordination in kentrolite isotypes. Open squares represent data for melanotekite and kentrolite (this study); filled squares represent
Image
Fourier-mappings ( F obs ) of the Pb sites in kentrolite-(Al), melanotekit...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 3. Fourier-mappings ( F obs ) of the Pb sites in kentrolite-(Al), melanotekite, and kentrolite illustrating differences in electron density (16 contour levels with 20 e/Å 3 ).
Image
Fourier maps ( F obs ) with projection from c on the a–b plane, Pb-pos...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 5. Fourier maps ( F obs ) with projection from c on the a–b plane, Pb-positions are shown for kentrolite-(Al) in Pbcn ( a ), melanotekite in Pbcn ( b ) and kentrolite in P 2 1 22 1 ( c ).
Image
Crystal structure of ( a ) kentrolite-(Al), ( b ) melanotekite, and ( c ) k...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 6. Crystal structure of ( a ) kentrolite-(Al), ( b ) melanotekite, and ( c ) kentrolite, projected from c on the a–b plane. Lead positions with high site occupation factor (SOF) are shown as black and gray filled circles. Split lead positions with low SOF are shown as small white
Image
(a) Photomicrograph of glaze thin section (sample SGB10, PPL) showing brown...
in Thin-section petrography and SR-µXRD for the identification of micro-crystallites in the brown decorations of ceramic lead glazes
> European Journal of Mineralogy
Published: 05 April 2017
) showing honey-colour crystals of kentrolite (ken). (d) XRD patterns of the analysed crystals. The reference pattern corresponds to JCPDF 01-075-2088 for kentrolite. (Online version in colour.)
Journal Article
Thin-section petrography and SR-µXRD for the identification of micro-crystallites in the brown decorations of ceramic lead glazes
Roberta Di Febo, Judit Molera, Trinitat Pradell, Oriol Vallcorba, Joan Carles Melgarejo, Claudio Capelli
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 05 April 2017
European Journal of Mineralogy (2017) 29 (5): 861–870.
...) showing honey-colour crystals of kentrolite (ken). (d) XRD patterns of the analysed crystals. The reference pattern corresponds to JCPDF 01-075-2088 for kentrolite. (Online version in colour.) ...
Image
BSE-image shows euhedral kentrolite crystals with small braunite inclusions...
in Crystal structures of synthetic melanotekite (Pb 2 Fe 2 Si 2 O 9 ), kentrolite (Pb 2 Mn 2 Si 2 O 9 ), and the aluminum analogue (Pb 2 Al 2 Si 2 O 9 )
> American Mineralogist
Published: 01 April 2008
F igure 2. BSE-image shows euhedral kentrolite crystals with small braunite inclusions in a matrix with Pb 2 SiO 4 composition.
Journal Article
A mechanism for the formation of the mineralized Mn deposits at Merehead Quarry, Cranmore, Somerset, England
Journal: Mineralogical Magazine
Published: 01 December 2006
Mineralogical Magazine (2006) 70 (6): 629–653.
... of mineral-forming reactions. The heating process also converted the manganate minerals to Mn oxides, releasing some of their entrained heavy metal content for participation in mineral-forming reactions. Initially, high- T silicate minerals such as kentrolite and melanotekite were formed...
Image
(continued) (E) stercorite, {(NH 4 )(H 2 O) 4 } [Na(PO 3 OH)] ( Ferraris &a...
in Structure Topology and Graphical Representation of Decorated and Undecorated Chains of Edge-Sharing Octahedra
> The Canadian Mineralogist
Published: 01 April 2021
Fig. 11. (continued) (E) stercorite, {(NH 4 )(H 2 O) 4 } [Na(PO 3 OH)] ( Ferraris & Franchini-Angela 1974 ); (F) linarite, {Pb} [Cu 2+ (SO 4 )(OH) 2 ] ( Bachmann & Zemann 1960 ); (G) mélonjosephite, {Ca} [Fe 2+ Fe 3+ (PO 4 )(OH)] ( Kampf & Moore 1977 ); (H) kentrolite, {Pb2} [Mn 2 Si
Journal Article
A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40 Ar- 39 Ar dating
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 August 2011
European Journal of Mineralogy (2011) 23 (4): 661–673.
... Mn 3+ Mn 2+ 14 (Si 9 O 22 ) 4 (OH) 10 .4H 2 O] and/or fibrous sugilite. Unzoned assemblages contain a similar mineralogy, comprising albite, K-feldspar, quartz, sugilite, norrishite, serandite, armbrusterite and minor witherite, strontianite and kentrolite [PbMn 2 O 2 (Si 2 O 7 )]. Similarities...
Image
(a) Photomicrograph of glaze thin section (sample SGB10, PPL), showing dark...
in Thin-section petrography and SR-µXRD for the identification of micro-crystallites in the brown decorations of ceramic lead glazes
> European Journal of Mineralogy
Published: 05 April 2017
) form aggregates which look like a dendritic texture. Honey-colour, thin lath-like crystals of kentrolite (ken) are also visible. (d) Same as in (c) in SEM, BSE mode. (e) Photomicrograph, in reflected light, showing the low reflectance of the three types of crystallite (br1, br2 and ken). (f) Same
Journal Article
Yangite, PbMnSi 3 O 8 ·H 2 O, a new mineral species with double wollastonite silicate chains, from the Kombat mine, Namibia
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2539–2543.
..., helvite, and barite; and a rare assemblage in the Kombat Central ore body of manganite-nambulite-serandite-barite-cahnite-brushite-kentrolite-calcite-gypsum. Yangite presumably comes from the narrow rhodochrosite-bearing veins. Dunn (1991) reviewed rare minerals found in the Kombat Mine, including...
Journal Article
Structure Topology and Graphical Representation of Decorated and Undecorated Chains of Edge-Sharing Octahedra
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 April 2021
The Canadian Mineralogist (2021) 59 (1): 9–30.
...Fig. 11. (continued) (E) stercorite, {(NH 4 )(H 2 O) 4 } [Na(PO 3 OH)] ( Ferraris & Franchini-Angela 1974 ); (F) linarite, {Pb} [Cu 2+ (SO 4 )(OH) 2 ] ( Bachmann & Zemann 1960 ); (G) mélonjosephite, {Ca} [Fe 2+ Fe 3+ (PO 4 )(OH)] ( Kampf & Moore 1977 ); (H) kentrolite, {Pb2} [Mn 2 Si...
Journal Article
CALDERITE-RICH GARNET AND FRANKLINITE-RICH SPINEL IN AMPHIBOLITE-FACIES HYDROTHERMAL SEDIMENTS, GAMSBERG Zn–Pb DEPOSIT, NAMAQUA PROVINCE, SOUTH AFRICA
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 April 2005
The Canadian Mineralogist (2005) 43 (2): 585–599.
... minerals are presented in Table 5 . The compositions of carbonate and amphibole correspond to manganoan calcite and manganoan tremolite, respectively. The latter may contain up to 1.4 wt.% ZnO. Melanotekite is poor in Mn, demonstrating limited solid-solution toward the Mn 3+ end-member kentrolite...
Journal Article
Rongibbsite, Pb 2 (Si 4 Al)O 11 (OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 January 2013
American Mineralogist (2013) 98 (1): 236–241.
.... Schlemper E.O. ( 1991 ) The kentrolite-melanotekite series, 4Pb 2 (Mn,Fe) 3+ 2 O 2 [Si 2 O 7 ]: Chemical crystallographic relations, lone-pair splitting, and cation relation to 8URe 2 . American Mineralogist , 76 , 1389 – 1399 . Mozgawa W. Handke M. Jastrzebski W. ( 2004...
Journal Article
Tokyoite, As-rich Tokyoite, and NoÉlbensonite: New Occurrences from the Postmasburg Manganese Field, Northern Cape Province, South Africa
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 November 2015
The Canadian Mineralogist (2015) 53 (6): 981–990.
... & Beukes (1996a) , who list no less than 135 different species, including such rare minerals as banalsite, kentrolite, kornite, sérandite, armbrusterite, norrishite, and sugilite. Further south, in the broad area between the towns of Kathu and Postmasburg, lies the Postmasburg manganese field (PMF; Fig. 1...
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