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Magadiite
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Magadiite : ウィキペディア英語版
Magadiite

Magadiite is a hydrous sodium silicate mineral (NaSi7O13(OH)3·4(H2O)) which precipitates from alkali brines as an evaporite phase. It forms as soft (Mohs hardness of 2) white powdery monoclinic crystal masses.〔(Mineral Handbook )〕〔(Webmineral )〕 The mineral is unstable and decomposes during diagenesis leaving a distinctive variety of chert (Magadi-type chert).〔''Encyclopedia of Sediments & Sedimentary Rocks'', Springer, 2003, p. 417, ISBN 1-4020-0872-4〕
The mineral was first described by Hans P. Eugster in 1967 for an occurrence in Lake Magadi, Olduvai Gorge, Kenya.〔〔 It is also reported from alkalic intrusive syenites as in Mont Saint-Hilaire, Canada.〔
==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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