bipyramid

A Dictionary of Earth Sciences | 1999 | 474 words | Copyright

bipyramid In crystallography, a pyramid defines a crystal face which cuts the vertical ‘c’ (or ‘z’) axis and one or two of the horizontal ‘a’ (or ‘x’) and ‘b’ (or ‘y’) axes. In general, the prefix ‘bi-’ refers to the repetition of faces about a plane of symmetry; ‘di-’ usually suggests the presence of an axis of symmetry about which the pyramid may be rotated.

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AILSA ALLABY and MICHAEL ALLABY. "bipyramid." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "bipyramid." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-bipyramid.html

AILSA ALLABY and MICHAEL ALLABY. "bipyramid." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-bipyramid.html

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