...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...

..., 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...

..., 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...

... 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...

... 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...

... (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...

... 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...

...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...

... 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...

...) . 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...

... 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...

... , 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...

... 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...

...), 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...

.... 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...

... 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...