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Pimelite was discredited as a mineral species by the International Mineralogical Association (IMA) in 2006, in an article which suggests that “pimelite” specimens are probably willemseite (which is approved), or kerolite (which is also discredited). This was a mass discreditation, and not based on any re-examination of the type material (assuming any exists).〔Burke (2007) Canadian Mineralogist: 44-6: 1557〕 Nevertheless, a considerable number of papers have been written, verifying that pimelite is a nickel-dominant smectite.〔(Mindat.org )〕〔Economic Geology (1949) 44:13〕〔Economic Geology (2004) 99:1197〕〔Faust (1966) American Mineralogist 51:279〕〔Manceau and Calas (1985) American Mineralogist 70: 549〕 It is always possible to redefine a mineral wrongly discredited.〔 The mineral was erroneously assumed to be a nickel-rich talc in a paper published in the American Mineralogist in 1979,〔Brindley, Bish and Wan (1979) American Mineralogist 64:615〕 but it had already been determined to be a smectite as early as 1938, and this was confirmed in another article in the American Mineralogist in 1966.〔 Both nickel-bearing talc and nickel dominant smectite occur at the type locality, Szklary, Ząbkowice Śląskie County, Lower Silesia, Poland.〔 == Mineral group == According to the literature pimelite belongs to the smectite group, trioctahedral subgroup. (“Smectite” is the name of a group of minerals, not the name of a mineral species). Subgroup members:〔 *hectorite (IMA questionable status) Na0.3(Mg,Li)3Si4O10(OH)2〔(Webmineral data )〕 *pimelite (IMA discredited) Ni3Si4O10(OH)2.4H2O〔 *saponite (Ca,Na)0.3(Mg,Fe2+)3(Si,Al)4O10(OH)2·4H2O〔http://rruff.info/ima〕 *sauconite Na0.3Zn3(Si,Al)4O10(OH)2·4H2O〔 *stevensite (IMA questionable status) (Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2.n(H2O)〔 *yakhontovite (Ca,Na,K)0.2(Cu,Fe,Mg)2Si4O10(OH)2·3H2O〔 *zincsilite Zn3Si4O10(OH)2·4H2O〔 Smectite group minerals are phyllosilicate clay minerals.〔 Pimelite apparently constitutes part of the mixtures called garnierite or noumeite, and it could form a series with stevensite or saponite.〔 It has a molar mass of 554.5 g.〔http://www.wolframalpha.com/entities/minerals/pimelite〕 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「Pimelite」の詳細全文を読む スポンサード リンク
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