Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2016 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R1-11
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R1: Characterization and description of minerals
Symmetry lowering in some hingganite related minerals
*Ritsuro MiyawakiKoichi MommaSatoshi MatsubaraMasako ShigeokaAkiyoshi OkamotoRoy Kristiansen
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Abstract

A B-bearing hingganite related mineral shows an ordering of (Y,Yb)/(Y,Ca) at the 8-coordinated Y-sites to lower the symmetry of monoclinic crystal structure from P21/a to P21. This mineral, [(Y,Yb)(Y,Ca)]( ,Fe)Si2(Be,B)2O8(OH)2, is characterized with a solid solution towards datolite composition [Ca2 Si2B2O8(OH)2] in addition to the other end member composition [YCa Fe3+Si2Be2O8(OH)2].

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© 2016 Japan Association of Mineralogical Sciences
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