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Tuperssuatsiaite : ウィキペディア英語版 | Tuperssuatsiaite
Tuperssuatsiaite is a rare clay mineral found in Greenland, Namibia and Brazil. It is a hydrated phyllosilicate (sheet silicate) of sodium and iron. == Discovery == Tuperssuatsiaite was first found by Karup-Moller and Petersen in Greenland, in 1984, and given the International Mineralogical Association designation IMA1984-002. It was later named after the type locality, Tuperssuatsiat Bay, Ilimaussaq, Greenland.〔 In 1992 Karup-Moller and Petersen, together with von Knorring and Leonardsen, found more specimens from a second find in the Aris Quarry in Namibia, that allowed a better definition of the properties and composition of the mineral.〔〕 Later still, in 2005, more material was found by a group of researchers from the University of São Paulo at the Bortolan Quarry, Pocos de Caldas, Brazil, and although the crystals were small, accurate determinations were made of their physical and optical properties, which differed slightly from those of the specimens from Greenland and Namibia.〔Atencio, Coutinho and Vlach (2005) The Mineralogical Record 36-3: 275-280〕
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