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Zanazziite
Zanazziite is a complex hydrated phosphate mineral from the rosherite group. It is a magnesium beryllium phosphate mineral.〔Atencio, D., Chukanov, N.V., Coutinho, J.M.V., Menezes Filho, L.A D., Dubinchuk, V.T. and Möckel, S.(2007) Ruifrancoite, a new Fe3+ -dominant monoclinic member of the roscherite group from Galilea, Minas Gerais, Brazil. The Canadian Mineralogist.,45, 1263-1273.〕 Zanazziite arises as barrel-shaped crystals and can reach up to 4 mm. It grows alongside quartz minerals.〔 It is found in the crevices of Lavra da Ilha pegmatite, near Taquaral, in northeastern Minas Gerais, Brazil.〔Leavens, P.B., White, J.S., and Nelen, J.A.(1990) Zanazziite a new mineral from Minas Gerais,Brazil. The Mineralogical record 21, 413-417.〕 Zanazziite is named after Dr. Pier F. Zanazzi (born 1939). Zanazziite has an ideal chemical formula of Ca2Mg5Be4(PO4)6(OH)4
*6H2O.〔
==Composition==
Zanazzite was recently analyzed with an ARL-SEMQ microprobe; the values were Durango apatite for P, Rockport fayalite for Mn, and Kakanui hornblende for all others.〔 In a separate sample, Beryllium was 84.93 mg by atomic absorption spectrophotometry. To determine water an H analyzer was used on duplicate samples of about 25 mg. FeO was determined by titration. The spectroscopic analysis and other microprobes reveled P2O5, 39.27, Si02 0.36, Al2O3 1.54, Fe203 0.76, CaO 10.65, MgO 11.66, FeO 9.63, MnO 1.77, BeO 9.81, H20 13.32, total of 98.77.〔〔Fanfani, L., Zanazzi, P.F., and Zanzari, A.R. (1977) The crystal structure of roscherite. Tschermaks Min. Petr.Mitt., 22, 266-277.〕 Zanazziite belongs to the roscherite-group. The roscherite-group nomenclature is based on the dominant cation in the Me-site; valid species include: Roscherite (Mn2+), Zanazziite (Mg2+) and Greifensteinite (Fe2+).〔 The chemical relationship among all of the minerals in the roscherite group rely on a common formula (roscherite) Ca2Mn5Be4(PO4)6(OH)4
*6H2O, in which the Mn site can be occupied by other cations previously mentioned.〔Rastsvetaeva, R.K., Chukanov, N.V., and Verin, I.A.(2005) Crystal structure of roscherite. Dok. Akad. Nauk. Russia, 403, 768-771.〕
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