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ettringite
Ettringite is a hydrous calcium aluminium sulfate mineral with formula: Ca6Al2(SO4)3(OH)12·26H2O. It is a colorless to yellow mineral crystallizing in the trigonal system. The prismatic crystals are typically colorless, turning white on partial dehydration.〔〔 It is part of the ettringite-group which includes other sulfates such as thaumasite and bentorite.〔(Ettringite-group ). Mindat.org〕
==Discovery and occurrence==
Ettringite was first described in 1874 by J.Lehmann,〔Lehmann, J. (1874): Über den Ettringit, ein neues Mineral in Kalkeinschlüssen der Lava von Ettringen (Laacher Gebiet). N. Jb. Mineral. Geol. Paläont., 273-275〕 for an occurrence near the Ettringer Bellerberg volcano, Ettringen, Rheinland-Pfalz, Germany.〔〔 It occurs within metamorphically altered limestone adjacent to igneous intrusive rocks or within xenoliths. It also occurs as weathering crusts on larnite in the Hatrurim Formation of Israel.〔 It occurs associated with portlandite, afwillite and hydrocalumite at Scawt Hill, Ireland and with afwillite, hydrocalumite, mayenite and gypsum in the Hatrurim Formation.〔 It has also been reported from the Zeilberg quarry, Maroldsweisach, Bavaria; at Boisséjour, near Clermont-Ferrand, Puy-de-Dôme, Auvergne, France; the N’Chwaning mine, Kuruman district, Cape Province, South Africa; in the USA, occurrences were found in spurrite-merwinite-gehlenite skarn at the 910 level of the Commercial quarry, Crestmore, Riverside County, California〔Carpenter, A.B. (1963): Oriented overgrowths of thaumasite on ettringite. Am. Mineral. 48〕 and in the Lucky Cuss mine, Tombstone, Cochise County, Arizona.〔〔
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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