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Santabarbaraite
Santabarbaraite is an amorphous ferric hydroxy phosphate mineral hydrate that was discovered in Tuscany, Italy in 2000.〔Pratesi G., Cipriani C., Guili G., and Birch W. D. (2003) Santabarbaraite: a new amorphous phosphate mineral. ''European Journal of Mineralogy''.''15'', 185-192〕 It also can be found in Victoria, Australia and Lake Baikal, Siberia.〔Fagel N., Alleman L. Y., Granina L., Hatert F., Thamo-Bozso E., Cloots R. and Andre L. (2005) Vivianite formation and distribution in Lake Baikal sediments. ''Global and Planetary Change''.''46'', 315-336〕 This phosphate mineral has a simplified formula Fe3+3(PO4)2(OH)3·5H2O,〔 which is the same formula of another non-amorphous phosphate mineral called allanpringite.〔Kolitsch U., Bernhardt H. J., Lengauer C. L., Blass G. and Tillmanns E. (2006) Allanpringite, Fe3(PO4)2(OH)3•5H2O, a new ferric iron phosphate from Germany, and its close relation to wavellite. ''European Journal of Mineralogy''.18, 793-801〕 Santabarbaraite occurs as pseudomorphic masses after vivianite (Fe2+3(PO4)2·8H2O). In the process, monoclinic vivianite oxidizes to form the amorphous santabarbaraite.〔 Pseudomorphism can be seen in Victoria, Australia in Wannon Falls which is originally a well-known locality for vivianite and at Lake Baikal, Siberia where the oxidized santabarbaraite can be seen as a rim surrounding vivianite due to exposure to air.〔
== Physical properties ==
Santabarbaraite samples, due to pseudomorphism, show elongated and flattened prism habits. The bulk crystal colour is brown to light brown and but appears yellow brown when viewed in an optical microscope. The mineral's streak colour is also yellow-umber.〔 Santabarbaraite has a vitreous to greasy luster and shows no fluorescence under ultra violet light. It is also translucent and shows good parting along the cleavage of its original mineral vivianite at . Santabarbaraite's density is 2.24 g/cm3. The mineral is isotropic with refractive index n=1.659.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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