...C. Biagioni; P. Orlandi; F. Nestola; S. Bianchin Abstract The new mineral species oxycalcioroméite, Ca 2 Sb 2 5 + O 6 O, has been discovered at the Buca della Vena mine, Stazzema, Apuan Alps, Tuscany, Italy. It occurs as euhedral octahedra, up to 0.1 mm in size, embedded in dolostone lenses...

...Kai Qu; Pei Ni; Guang Fan; Guowu Li; Yanjuan Wang ABSTRACT Stibiotantalite, SbTaO 4 , from the Nanyangshan LCT pegmatite, North Qinling Orogen, Central China is described. The mineral is associated with oxystibiomicrolite, oxycalcioroméite, hydrokenomicrolite, hydroxynatromicrolite , hydromicrolite...

... 6.64 (OH) 0.03 ] Σ6.67 . Oxyplumboroméite is the Pb analogue of oxycalcioroméite, ideally Ca 2 Sb 2 O 7 . * E-mail: [email protected] 11 7 2013 12 8 2013 © 2013 The Mineralogical Society 2013 oxyplumboroméite pyrochlore supergroup roméite group new mineral crystal...

... & Bosi 2013 ), oxycalcioroméite ( Biagioni et al. 2013 ), fluornatropyrochlore ( Yin et al. 2013 ), fluorcalciopyrochlore ( Li et al. 2013 ), oxynatromicrolite ( Fan et al. 2013 ), and hydroxycalciomicrolite ( Andrade et al. 2013c ). The nomenclature system introduced by Atencio et al. (2010...

.... In specimen #20140122, euhedral octahedra or subhedral grains up to 1 mm of oxycalcioroméite represent a minor phase in a cm-sized irregular veinlets rich in quartz and pectolite with minor amounts of calcite and manganoan diopside, which brecciate a fine-grained (Ø ≤ 0.2 mm) calc-silicate rock composed...

..., fluorcalcioroméite, oxycalcioroméite Stannomicrolite Rn D / Rd D Type material of sukulaite is now type oxystannomicrolite. Other instances are Ca- or zero-valent-dominant microlite species Stetefeldtite Q D Q May be Ag-dominant roméite species Stibiconite G D Q May be Sb-dominant or other...

.... Bianchin (2013) Oxycalcioroméite, Ca 2 Sb 2 O 6 O, from Buca della Vena mine, Apuan Alps, Tuscany, Italy: a new member of the pyrochlore supergroup. Mineralogical Magazine, 77(7), 3027–3037. U. Hålenius and F. Bosi (2013) Oxyplumboroméite, Pb 2 Sb 2 O 7 , a new mineral species of the pyrochlore...

...°40′59″W) Anthony R. Kampf*, Joseph J. Pluth, Yu-Sheng Chen, Andrew C. Roberts and Robert M. Housley Oxycalcioroméite Ca 2 Sb 2 O 7 Buca della Vena mine, Apuan Alps, Tuscany, Italy (43°59′55″N 10°18′37″E) Cristian Biagioni* and Paolo Orlandi *E-mail: [email protected]...

... position to the less symmetrical 96 g position was confirmed in oxycalcioroméite ( Biagioni et al . 2013 ). However, such a displacement was not observed for the A -site cations in the present pyrochlores. It is recommended, for stereochemical reasons, that the K + cation, together with Cs...

.... The crystal structure was refined using Shelxl -2014 ( Sheldrick, 2015 ), starting from the atomic fractional coordinates of oxycalcioroméite ( Biagioni et al. , 2013 ), excluding the A ' position. Scattering curves for neutral atoms were taken from the International Tables for Crystallography ( Wilson...

.... Only half of the possible split Sb sites were occupied, such that the overall space-group symmetry was reduced from F d 3 ¯ m to F 43 ¯ m . A similar displacement of Sb 3+ positions, but without long-range loss of centrosymmetry, was deduced for oxycalcioroméite ( Biagioni...

... known secondary Sb minerals from the deposit are cervantite, Sb 2 O 4 , coquandite, kermesite, Sb 2 S 2 O, peretaite, sénarmontite, Sb 2 O 3 and members of the roméite group ( Preite, 1993 ). Oxycalcioroméite is Ca 2 Sb 2 O 7 . In order to evaluate stability relationships with respect to other more...

...,OH) 7 ) such as oxycalcioroméite, Ca 2 Sb 2 O 7 , and oxyplumboroméite, Pb 2 Sb 2 O 7 , have in controlling the dispersion of Sb in the supergene environment ( Diemar et al. , 2009 ; Filella et al. , 2009 , Majzlan et al. , 2011 ). However, it remains apparent that other mineralogical controls...