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Francolite Francolite is a carbonate rich variety of the mineral fluorapatite〔http://www.mindat.org/min-4910.html Mindat.org〕 and is present in most sedimentary phosphorites. It has a variable chemical composition which can be represented by (Ca,Mg,Sr,Na)10(PO4,SO4,CO3)6F2−3.〔R. A. Benmore, M. L. Coleman, and J. M. McArthur, Origin of is sedimentary francolite from its sulphur and carbon isotope composition. Nature 302: 516, 1983 ()〕 The mineral was named after its occurrence at Wheal Franco, Whitchurch, Tavistock District, Devon, England.〔 ==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「Francolite」の詳細全文を読む
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