The Crystal Structure of Kotoite Mg<SUB>3</SUB>B<SUB>2</SUB>O<SUB>6</SUB>
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概要
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The crystal structure of Kotoite (Mg<SUB>3</SUB>B<SUB>2</SUB>O<SUB>6</SUB>), a new mineral found from Suan Mine, Korea by T. Watanabe, has been determined by X-ray methods using oscillation and Weissenberg photographs (Co-Ka) and the ionization spectrometer (Mo-Ka) . The space group is D<SUP>12</SUP><SUB>2<I>h</I></SUB>-<I>Pnmn</I>, (<I>hk</I>0) and (0<I>kl</I>) reflexions beiog absent respectively when <I>h+k</I> and <I>k+l</I> are odd. The unit cell has the dimensions <I>a</I>=5.33<SUB>5</SUB>A, <I>b</I>=8.40<SUB>0</SUB> A and <I>c</I>=4.48<SUB>7</SUB> A. There are two molecules of Mg<SUB>3</SUB>B<SUB>2</SUB>O<SUB>6</SUB> (sp. gr. 3.11.) .<BR>Closelyy resembling the olivine group, the structure is based fundamentally on the hexagonal closest packing of oxygen atoms. Each B atom is at the center of a triangle formed by three oxygen atoms and each Mg atom is surrounded by eight oxygen atoms arranged nearly octakedrally. Each oxygen atom is shared by three Mg and one B atoms.
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