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cafarsite

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Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 859–868.
...Georgia Cametti; Mariko Nagashima; Martin Fisch; Thomas Armbruster The crystal structure of cafarsite from Wanni glacier, Monte Cervandone, was re-investigated by single-crystal X-ray diffraction (space group Pn −3, R 1 = 0.022) and new electron-microprobe analyses. The REE (mainly Ce and Y) were...
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Optical microscope pictures of <span class="search-highlight">cafarsite</span> samples. (a) Cafarsite1 specimen u...
Published: 01 July 2018
Fig. 1 Optical microscope pictures of cafarsite samples. (a) Cafarsite1 specimen used for structural and chemical investigation. Well-shaped cubo-octhaedral black crystals on quartz and clay minerals. (b) Cafarsite2 specimen: big dark-gray-brown and smaller reddish octahedral-shaped crystals. (c
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(a) Fragment of the <span class="search-highlight">cafarsite</span> crystal-structure emphasizing the connection ...
Published: 01 July 2018
Fig. 3 (a) Fragment of the cafarsite crystal-structure emphasizing the connection between different polyhedra. Site occupancies are shown by partially colored sites. (b) AsO 3 trigonal pyramid: oxygen atoms are represented as red spheres. (Online version in colour)
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Coordination of F site (pink sphere) in the <span class="search-highlight">cafarsite</span> structure. Oxygen ato...
Published: 01 July 2018
Fig. 7 Coordination of F site (pink sphere) in the cafarsite structure. Oxygen atoms (O7) are shown as red spheres. The Ca1 site is reported as two-colored sphere to indicate partial occupancy by Ca and REE. Gray and two-colored cylinders represent the Ca–O and F–Ca bonds, respectively. (Online
Journal Article
Published: 01 October 1994
American Mineralogist (1994) 79 (9-10): 996–1002.
..., the mineral appears creamy white; anisotropy is visible along the grain boundaries. Reflectance values (in air) are 15.4–16.0% (470 nm), 15.3–15.8% (546 nm), 14.8–15.2% (589 nm), 14.2–15.0% (650 nm). Fetiasite and other associated arsenic minerals (e.g., asbecasite, cafarsite, cervandonite) are products...
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Scanning electron micrographs of As-bearing minerals (indicated by arrows) ...
Published: 01 April 2012
F igure 4 Scanning electron micrographs of As-bearing minerals (indicated by arrows) in a hardpan at the Shizishan Cu–Au mine, Tongling, eastern China. ( A ) Scorodite (FeAsO 4 ·2H 2 O), ( B ) cafarsite [Ca 8 (Fe 2+ , Fe 3+ ) 6-7 (AsO 3 ) 12 · 2(H 2 O)], ( C ) arsenolite (As 2 O 3 ), and ( D
Journal Article
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 423–430.
..., and account for the presence of the lone pair, in agreement with the VSEPR theory ( Gillespie & Hargittai 1991 ). The presence of most of the arsenic as As 3+ instead of As 5+ is not surprising, in view of the profusion in the same environment of other arsenites, such as cafarsite, fetiasite...
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Journal Article
Published: 01 October 2013
Mineralogical Magazine (2013) 77 (7): 3019–3026.
... named Cherbadung) overlooks the Devero Valley on the Italian side and the Wanni Glacier on the Swiss side. It hosts mineral deposits which are among the most renowned in the Lepontine Alps. Six new REE -arsenates and REE -arsenites including asbecasite ( Graeser, 1966 ), cafarsite ( Graeser, 1966...
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Journal Article
Published: 01 October 2019
American Mineralogist (2019) 104 (10): 1469–1480.
... arsenates on cafarsite ( Appiani et al. 2017 ). Manganese rocks of different geneses are often enriched in arsenic, reaching concentrations several times higher than the mean values for both sedimentary rocks and for the upper part of the continental crust as a whole ( Li and Schoonmaker 2003 ; Maynard...
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Journal Article
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 487–494.
... (Ti,Sn 4+ )As 6 3+ Si 2 Be 2 O 20 ] and cafarsite [Ca 8 (Ti,Fe 2+ ,Fe 3+ ,Mn) 6–7 (As 3+ O 3 ) 12 ·4H 2 O] ( Graeser 1966 ); cervandonite-(Ce) [(Ce,Nd,La)(Fe 3+ ,Fe 2+ ,Ti 4+ ,Al) 3 O 2 (Si 2 O 7 ) 1–x+y (AsO 3 ) 1+x–y (OH) 3x–3y ] ( Demartin and Gramaccioli 2008 ); fetiasite [(Fe 2+ ,Fe 3+ ,Ti) 3 O...
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Journal Article
Published: 19 August 2022
Mineralogical Magazine (2022) 86 (6): 966–974.
... Cervandone, in the Devero Valley, and the Swiss Wannigletscher (also named Cherbadung) are the type localities of rare earth element (REE) arsenates and arsenites including asbecasite (Graeser, 1966 ), cafarsite (Graeser, 1966 ), cervandonite-(Ce) (Armbruster et al. , 1988 ), fetiasite (Graeser et al...
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Journal Article
Journal: Elements
Published: 01 April 2012
Elements (2012) 8 (2): 119–124.
...F igure 4 Scanning electron micrographs of As-bearing minerals (indicated by arrows) in a hardpan at the Shizishan Cu–Au mine, Tongling, eastern China. ( A ) Scorodite (FeAsO 4 ·2H 2 O), ( B ) cafarsite [Ca 8 (Fe 2+ , Fe 3+ ) 6-7 (AsO 3 ) 12 · 2(H 2 O)], ( C ) arsenolite (As 2 O 3 ), and ( D...
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Journal Article
Published: 01 December 2018
Mineralogical Magazine (2018) 82 (6): 1369–1379.
... as an essential constituent. These data were examined carefully by the CNMNC officers and were considered reliable. Accordingly it was agreed to modify the formula of vigrishinite in the official IMA List of Minerals. A paper on the mineral cafarsite has been recently published [ European Journal...
Journal Article
Published: 01 April 2014
American Mineralogist (2014) 99 (4): 793–803.
...) . Table 1 Chemical composition of uncommon minerals mentioned in the text Mineral Formula asbecasite Ca 3 TiAs 6 Be 2 Si 2 O 20 baumhauerite Pb 12 As 16 S 36 cafarsite Ca 5.9 Mn 1.7 Fe 3 Ti 3 (AsO 3 ) 12 ·4–5H 2 O cervandonite-(Ce) (Ce,Nd,La)(Fe 3+ ,Fe 2+ ,Ti,Al) 3 O 2 (Si 2 O...
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Journal Article
Published: 01 November 2018
European Journal of Mineralogy (2018) 30 (6): 1181–1189.
... 7 ) 2 O 3 (OH)(H 2 O) 4 , with sodium as an essential constituent. These data were examined carefully by the CNMNC officers and were considered reliable. Accordingly it was agreed to modify the formula of vigrishinite in the official IMA List of Minerals. A paper on the mineral cafarsite has...
Journal Article
Published: 01 May 2011
American Mineralogist (2011) 96 (5-6): 888–894.
... , reinerite Zn 3 (AsO 3 ) 2 and cafarsite Ca 5 (Ti, Fe, Mn) 7 (AsO 3 ) 12 ·4H 2 O . Journal of Raman Spectroscopy , 41 , 325 – 328 . Ghose , S. , Sen Gupta , P.K. , and Schlemper , E.O. ( 1987 ) Leiteite, ZnAs 2 O 4 : A novel type of tetrahedral layer structure with arsenite chains...
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Journal Article
Published: 19 January 2022
Mineralogical Magazine (2022) 86 (1): 150–167.
... contain open Alpine-type fissures, which host several REE-bearing accessory minerals, including cafarsite, synchysite-(Ce), chernovite-(Y), gasparite-(Ce), xenotime-(Y) and monazite-(Ce). Rutile, magnetite, hematite, titanite and tourmaline represent other common accessory minerals within these fissures...
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Journal Article
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 487–492.
...), and not completely described REE-arsenosilicate. Deveroite-(Ce) occurs only on crystals of cervandonite-(Ce) and is associated with agardite-(Ce), asbecasite, cafarsite, K-feldspar, muscovite, and quartz. It forms sprays of colorless elongated tabular or acicular prisms up to ~50 μm. It has a white streak, vitreous...
Journal Article
Published: 18 March 2020
Mineralogical Magazine (2020) 84 (3): 412–419.
.... and Bahfenne S. ( 2010 ) Raman spectroscopic study of the arsenite minerals leitite ZnAs 2 O 8 , reinerite Zn 3(AsO 3 )2 and cafarsite Ca 5 (Ti,Fe,Mn) 7 (AsO 3 ) 12 ⋅4H 2 O . Journal of Raman Spectroscopy , 41 , 325 – 328 . Frost R.L. , Duong L. , and Weier M. ( 2004 ) Raman...
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Journal Article
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 17–184.
... assemblage developed, with manganosite (MnO) and As 3+ -As 5+ minerals, e.g., turtmannite ( Brugger et al. 2001 ). Other occurrences with As 3+ minerals are known, e.g., asbecasite, cafarsite, fetiasite, or even As 3+ -enriched titanite ( Fig. 4 , Krzemnicki and Gieré 1996 ). Otherwise, the minerals...
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