カルシウム角閃石系列の結晶構造中での陽イオン席占有について

小澤 優; 栗林 貴弘; 長瀬 敏郎

doi:10.14824/jakoka.2015.0_89

2015 Annual Meeting of Japan Association of Mineralogical Sciences

Session ID : R2-P06

DOI https://doi.org/10.14824/jakoka.2015.0_89

Conference information

Host: Japan Association of Mineralogical Sciences

R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

Cation site occupancy in crystal structure of calcic amphiboles

*Masaru Kozawa, Takahiro Kuribayashi, Toshiro Nagase

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Keywords: amphibole, single-crystal X ray diffraction, bond distance, site occupancy

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

A knowledge of the site occupancies and order-disorder relationships in the amphibole is essential to a better understanding of their crystal chemistry. In this study four natural amphibole were studied by using single-crystal X-ray diffraction method. XRD measurement showed that the T1-O bond lengths are longer than T2-O bond lengths respectively in pargasite and edenite, due to ^[4]Al ordering in T1 site. Also it showed that the M2-O bond lengths are shorter than M1-O and M3-O bond lengths in pargasite, due to ^[6]Ti and ^[6]Al ordering in M2 site.

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