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churchite

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Journal Article
Published: 01 December 2015
European Journal of Mineralogy (2015) 27 (6): 813-819.
...Marco E. Ciriotti Abstract Churchite-(Nd) and iodine, up to now recognized as valid minerals by IMA CNMNC, are discredited because, for different reasons, both are non-existent mineral species and were never actually characterized. Churchite-(Nd) is in fact neodymium-rich churchite-(Y) and iodine...
Journal Article
Published: 01 October 2011
The Canadian Mineralogist (2011) 49 (5): 1305-1333.
... veins with various associations, including Cu– Pb, Pb–Zn and Co–Bi–Ag–U assemblages in sandstones, gneisses and granites. The REE minerals, including mixite-group minerals ([REE,Bi,Ca,Pb]Cu 6 (AsO 4 ,AsO 3 OH) 3 OH 6 •3H 2 O), rhabdophane and churchite (REEPO 4 •H 2 O and REEPO 4 •2H 2 O), chukhrovite...
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Journal Article
Published: 01 July 2005
American Mineralogist (2005) 90 (7): 1203-1208.
...Ştefan Marincea; Delia-Georgeta Dumitraş Abstract In a recent work, Onac and White (2003) reported on berlinite, but also chlorellestadite and churchite, from the Bivouac Room, Cioclovina Cave, Romania. Our analyses of materials collected from this site failed to identify berlinite...
Image
Representative REE patterns of rhabdophane and <b>churchite</b> (determined by EMP...
Published: 01 October 2011
Fig. 7 Representative REE patterns of rhabdophane and churchite (determined by EMPA) and bastnäsite (determined by LA–ICP–MS).
Journal Article
Published: 01 October 2008
The Canadian Mineralogist (2008) 46 (5): 1131-1157.
... hydrothermal conditions to complex mineral aggregates (stubby kolbeckite II) produced under weathering conditions. The latest supergene alteration consists of wavellite, beraunite, cacoxenite, strengite, P- and Mn-bearing “limonite”, autunite, Sc-bearing vochtenite, Sc-bearing churchite-(Y) and diadochite...
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Journal Article
Published: 01 April 2009
European Journal of Mineralogy (2009) 21 (2): 507-514.
... this occurrence, foggite, churchite-(Y) and colourless or milky-white needle-like brushite and gypsum were also documented. The empirical formula (calculated from the electron-microprobe results on the basis of five carbonate groups pfu ) is (Na 2.46 Ca 0.98 Sr 1.71 Ba 0.32 Y 0.05 Ce 0.17 La 0.08 Nd 0.08 Pr 0.02...
FIGURES
Journal Article
Published: 01 October 1966
American Mineralogist (1966) 51 (9-10): 1394-1405.
... to transform to perrierite above 600° C., and CeO 2 forms from both minerals at higher temperatures. Weathering products associated with perrierite include anatase, churchite, cerianite, bastnaesite, as well as minerals very close to ancylite and florencite. 25 1 1966 10 2 1966 Copyright...
Image
Phosphate minerals from the Trutzhofmühle aplite. a) Acicular rockbridgeit...
Published: 01 October 2008
during the Neogene (SEM, BSE image). c) Stubby crystal of kolbeckite (type II) growing into a cavity of siliceous gangue (stage V) (SEM, BSE image). d) Rosettes of a Sc–U–Ca-bearing churchite-(Y) coating quartz formed during the Neogene (stage VI) (SEM, BSE image). e) Mn-rich apatite (ap) within (black
Journal Article
Published: 01 February 2009
The Canadian Mineralogist (2009) 47 (1): 208-210.
... description by Onac et al . (2002 , 2005) and Onac & White (2003) of some “exotic” mineral species such as berlinite, burbankite, churchite-(Y), ellestadite-(OH), ellestadite-(Cl), foggite, paratacamite, collinsite and sampleite, led to the Discussion by Onac & Effenberger presented above...
Journal Article
Published: 01 February 2009
The Canadian Mineralogist (2009) 47 (1): 207-208.
..., monetite, crandallite, and taranakite (Constantinescu et al . 1999, Onac et al . 2002, Marincea & Dumitraş 2003, Dumitraş et al . 2004) are accompanied by a number of rare mineral species such as tinsleyite, sampleite, paratacamite or clinoatacamite, churchite-(Y), and foggite (Marincea et al...
Journal Article
Published: 01 November 2007
American Mineralogist (2007) 92 (11-12): 1998-2001.
..., Ca(PO 3 OH)· 2H 2 O, for churchite-(Y), YPO 4 ·2H 2 O, and of hydroxyl-apatite, Ca 5 (PO 4 ) 3 (OH), for chlorellestadite, Ca 5 [(Si,P,S)O 4 ] 3 (Cl,OH,F), was assumed by Marincea and Dumitraş (2005) ; however, shifts opposite from those observed are required for these mineral pairs. Due...
Journal Article
Published: 01 April 2015
Mineralogical Magazine (2015) 79 (2): 247-251.
...) 2 ]O 2 (OF). IMA 15-C: Churchite-(Nd) (discredited) Proposal 15-C is accepted, and churchite-(Nd) is officially discredited. IMA 15-D: Iodine (discredited) Proposal 15-D is accepted, and iodine is officially discredited. ...
Journal Article
Published: 01 August 2003
American Mineralogist (2003) 88 (8-9): 1395-1397.
.... Between 1912 and 1941, more than 30,000 m 3 of guano-derived phosphate sediments were mined and used as fertilizer. This deposit contains a fascinating assemblage of minerals that includes, apart from many rare and/ or unusual phosphates (e.g., berlinite, chlorellestadite, churchite, leucophosphite...
FIGURES
Series: Reviews in Economic Geology
Published: 01 January 2016
DOI: 10.5382/Rev.18.01
EISBN: 9781629490922
...,Ca,REE) 3 (CO3) 5 Carbocernaite (Ca,Na)(Sr,REE)(CO 3 ) 2 Cerianite (Ce) (Ce 4 +,Th)O 2 Cerite (Ce) CegFe 3 +(SiO 2 ) 6 [(SiO 3 )(OH)](OH) 3 Cheralite (Ca,Ce,Th)(P,Si)O 4 Chevkinite (Ca,Ce,Th) 4 (Fe 2 +,Mg) 2 (Ti,Fe 3 +) 3 Si 4 O 22 Churchite...
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Journal Article
Published: 01 October 2018
Mineralogical Magazine (2018) 82 (5): 1049-1055.
..., biotite, ‘zinnwaldite’, anglesite, bastnäsite-(Ce), bismite, bismuth, bismuthinite, bismutite, cassiterite, caysichite-(Y), churchite-(Y), columbite-(Mn), emplectite, fergusonite-(Y), fluorite, gadolinite-(Y), gahnite, galena, hingganite-(Y), hingganite-(Yb), kainosite-(Y), kamphaugite-(Y), kasolite...
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Journal Article
Published: 01 June 2019
American Mineralogist (2019) 104 (6): 810-816.
.... , Hatert , F. , Nickel , E.H. , and Ferrais , G. ( 2009 ) The standardization of mineral group hierarchies: Application to recent nomenclature proposals . European Journal of Mineralogy , 21 , 1073 – 1080 . Milton , D.J. , and Bastron , H. ( 1971 ) Churchite and florencite...
Journal Article
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 530-548.
... of uranyl minerals by goethite ( Fig. 2f ) and (more rarely) by uraninite III ( Fig. 2g ) as well as a replacement of pyrite by uraninite III ( Fig. 2h ) has been described ( Ramdohr 1963 ; Hofmann 1989 ; Markl and Wolfsried 2011 ). The REE phosphate churchite occurs quite commonly as late precipitation...
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Journal Article
Published: 01 April 2008
European Journal of Mineralogy (2008) 20 (2): 205-216.
...), or does it start from hydrated species (rhabdophane and churchite, respectively)? The early formation of xenotime during diagenesis has been well documented by Rasmussen (1996) in marine Archean to Cretaceous sandstones from Australia. Apparently, the direct crystallization of xenotime, without its...
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Journal Article
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 431-445.
..., francoanellite, gypsum, bassanite, calcite, vaterite, aragonite, hematite, goethite, birnessite, romanèchite, todorokite and kaolinite. Onac et al . (2002 , 2005) and Onac & White (2003) reported the presence of some exotic mineral species, such as berlinite, burbankite, churchite, ellestadite-(Cl...
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Journal Article
Published: 01 May 2019
American Mineralogist (2019) 104 (5): 641-651.
... . Burke , E. ( 2006 ) A mass discreditation of GQN minerals . Canadian Mineralogist , 44 , 1557 – 1560 . Ciriotti , M. ( 2015 ) Discreditation of the mineral species churchite-(Nd) and iodine . European Journal of Mineralogy , 27 , 813 – 819 . Dana , E.D. ( 1892...
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