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Hafnon is a hafnium silicate mineral, chemical formula (Hf,Zr)SiO4 or (Hf,Zr,Th,U,Y)SiO4.〔http://www.minerals.net/mineral/silicate/neso/zircon/hafnon.htm Minerals.net〕 In natural zircon ZrSiO4 part of the zirconium is replaced by the very similar hafnium and so natural zircon is never pure ZrSiO4. A zircon with 100% hafnium substitution can be made synthetically and is hafnon. Hafnon occurs as transparent red to red orange tetragonal crystals with a hardness of 7.5.〔http://www.mindat.org/min-1792.html Mindat〕 Hafnon occurs naturally in tantalum-bearing granite pegmatites in the Zambezia district, Mozambique and in weathered pegmatites at Mount Holland, Western Australia.〔http://www.handbookofmineralogy.org/pdfs/Hafnon.PDF Handbook of Mineralogy〕 It has also been reported from locations in Ontario, Quebec and Manitoba, Canada; North Carolina, United States; and in Zimbabwe.〔 ==References== *Emsley, John. ''Nature's Building Blocks.'' Oxford, 2001. ISBN 0-19-850341-5 * 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「hafnon」の詳細全文を読む スポンサード リンク
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