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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク macdonaldite ： ウィキペディア英語版 macdonaldite Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O.〔Alfors, J.T., Stinson, M.C., Matthews, R.A., and Pabst, A. (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist, 50, 314-340.〕 Macdonaldite was first described in 1965 and named for Gordon A. MacDonald (1911–1978) an American volcanologist at the University of Hawaii.〔 Macdonaldite crystallises in the orthorhombic system. Macdonaldite is anisotropic with low relief.〔Bloss, F.D. (1999) Optical Crystallography. Mineralogical Society of America, 5, 161-163.〕 Macdonaldite appears as veins and fracture coatings in a sanbornite and quartz bearing metamorphic rock. Macdonaldite was first described in 1965 for an occurrence near the Big Creek-Rush Creek area in Fresno County, California. It has also been reported from Mariposa and Tulare counties in California.〔〔 It has also been reported from a quarry in San Venanzo, Umbria, Italy.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「macdonaldite」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.