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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 hyalophane ： ウィキペディア英語版 hyalophane Hyalophane or jaloallofane is a crystalline mineral, part of the feldspar group of tectosilicates. It is considered a barium-rich potassium feldspar.〔(hyalophane – Britannica Online Encyclopedia )〕 Its chemical formula is (K,Ba)(), and it has a hardness of 6 – 6½. The name ''hyalophane'' comes from the Greek ''hyalos'', meaning "glass", and ''phanos'' meaning "to appear".〔 An occurrence of hyalophane was discovered in 1855 in Lengenbach Quarry, Imfield, in the municipality of Binn, Switzerland. The mineral is found predominantly in Europe, with occurrences in Switzerland, Australia, Bosnia, Germany, Japan, New Jersey, and the west coast of North America.〔 Hyalophane has a monoclinic crystallography, with cell properties a = 8.52 Å, b = 12.95 Å, c = 7.14 Å, and β = 116°. Optically, the material exhibits biaxial birefringence, with refractive index values of ''nα'' = 1.542, ''nβ'' = 1.545, and ''nγ'' = 1.547 and a maximum birefringence of δ = 0.005. It has weak dispersion and low surface relief.〔 ==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「hyalophane」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.