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Decrespignyite-(Y) is a copper yttrium rare earth carbonate chloride hydrate; ::With a simple formula of; Cu(Y, REE)4(CO3)4(OH)5Cl · 2H2O Usually found as single pseudohexagonal platelets, often curved, and regularly measuring 10-50μm in size. It appears as royal blue to turquoise blue in colour, with a pale blue streak, and a pearly to vitreous lustre. Regarded as a supergene mineral which is believed to be formed through by mildly carbonated ground waters precipitating through the ore body. It is often associated with malachite, (kamphaugite-(Y) ), donnayite-(Y) and (caysichite-(Y) )〔 ==Discovery== First discovered at the Paratoo copper mine, near Yunta, Olary district, South Australia; Decrespignyite-(Y) was first bought to the attention of Dr. Allan Pring (Principal Research Scientist and Head, Mineral Sciences, South Australian Museum 1984-2015) in 1998, by Mr. John Toma, a prominent South Australian mineral collector and amateur mineralogist. Mr. Toma had noted unusual properties of an unknown mineral specimen, requesting Dr. Pring and the SA museum Mineral Sciences team test the unknown sample. 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「Decrespignyite-(Y)」の詳細全文を読む スポンサード リンク
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