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Fluorellestadite
Fluorellestadite is a rare nesosilicate of calcium, with sulfate and fluorine, with the chemical formula Ca10(SiO4)3(SO4)3F2.〔 It is a member of the apatite group, and forms a series with hydroxylellestadite.
== Etymology ==
The mineral was originally named wilkeite by Eakle and Rogers in 1914, in honour of R. M. Wilke, a mineral collector and dealer.〔 In 1922, a sample of “wilkeite” was analysed and found to be sufficiently different from the material reported by Eakle and Rogers to consider it a new species.〔Duncan McConnell (1937) (The substitution of SiO4 – and SO4 – groups for PO4 -groups in the apatite structure; ellestadite, the end member ) American Mineralogist 22: 977–986〕 The name “ellestadite” was proposed, in honour of Reuben B Ellestad (1900–1993), an American analytic chemist from the Laboratory for Rock Analysis, University of Minnesota, USA.〔
In 1982 Rouse and Dunn showed that the Si:S ratio was close to 1:1, giving the formula Ca10(SiO4)3(SO4)3X2, where X represents fluorine (F), hydroxyl (OH) or chlorine (Cl), and they named minerals in this group the ellestadite group.〔Roland C. Rouse and Pete J. Dunn (1982) (A contribution to the crystal chemistry of ellestadite and the silicate sulfate apatites ) American Mineraleralogist 67: 90–96〕 The end members of the group were named hydroxylellestadite (X = OH), fluorellestadite (X = F) and chlorellestadite (X = Cl); ideal end-member chlorellestadite is assumed not to exist in nature, although it has been synthesized.〔 Wilkeite was discredited as a unique species, as it is not an end member of any solid solution series, but an intermediate member.〔
The name fluorellestadite was changed to ellestadite-(F) in 2008〔Burke (2008) The Mineralogical Record 39: 131〕 and changed back to fluorellestadite in 2010.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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