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kentrolite

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Journal Article
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...
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Journal Article
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
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 ) <span class="search-highlight">kentrolite</span>-(Al) compared to ( b ) ...
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
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Changes in lattice parameters as a function of ionic radii ( Shannon 1976 )...
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
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Fourier-mappings ( F  obs ) of the Pb sites in <span class="search-highlight">kentrolite</span>-(Al), melanotekit...
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 ).
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Fourier maps ( F  obs ) with projection from  c  on the  a–b  plane, Pb-pos...
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 ).
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Crystal structure of ( a ) <span class="search-highlight">kentrolite</span>-(Al), ( b ) melanotekite, and ( c ) k...
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
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(a) Photomicrograph of glaze thin section (sample SGB10, PPL) showing brown...
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
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.) ...
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BSE-image shows euhedral <span class="search-highlight">kentrolite</span> crystals with small braunite inclusions...
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
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...
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(continued) (E) stercorite, {(NH 4 )(H 2 O) 4 } [Na(PO 3 OH)] ( Ferraris &a...
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
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...
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(a) Photomicrograph of glaze thin section (sample SGB10, PPL), showing dark...
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
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...
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Journal Article
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...
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Journal Article
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...
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Journal Article
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...
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Journal Article
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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