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moganite
Moganite is a silicate mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in 1984.〔 Ralph, Jolyon, and Ida Ralph. "Moganite: Moganite Mineral Information and Data." MinDat. 2007. Aug. 2007 .〕 It crystallises in the monoclinic crystal system. Moganite is considered a polymorph of quartz: it has the same chemical composition as quartz, but a different crystal structure.〔
In 1994, the International Mineralogical Association (IMA) had disapproved it as being a separate species because it was not clearly distinguishable from quartz.〔 Origlieri, Marcus. "Moganite: a New Mineral -- Not!" Lithosphere (1994). Aug. 2007 .〕 It has only recently (2007) been approved as a valid species by the CNMNC, the Commission on New Minerals, Nomenclature and Classification (part of the IMA).〔 Nickel, Ernest H., and Monte C. Nichols. "IMA/CNMNC List of Mineral Names." Materials Data. June 2007. Aug. 2007 http://www.geo.vu.nl/users/ima-cnmmn/MINERALlist.pdf 〕
This mineral has been mainly found in dry locales such as Gran Canaria and Lake Magadi.〔 Heaney, Peter J., and Jeffrey E. Post. "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties." Science ns 255 (1992): 441-443. JSTOR. Aug. 2007. Keyword: moganite.〕 It has been reported from a variety of locations in Europe, India and the United States.〔 It was named for the municipality of Mogán on Gran Canaria.〔 Physically, it has a hardness of about 6, a dull luster and appears gray in color but transparent.
==References==
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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