isomorphism

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isomorphism

isomorphism , of minerals, similarity of crystal structure between two or more distinct substances. Sodium nitrate and calcium sulfate are isomorphous, as are the sulfates of barium, strontium, and lead. Crystals of isomorphous substances are almost identical. The substances sometimes crystallize together in a solid solution. Isomorphous substances usually have similar chemical formulas, and the polarizability and ratio of anion and cation radii are generally comparable (see ion ). Isomorphism was discovered (c.1820) by Eilhard Mitscherlich, who stated the principle that isomorphous substances have similar chemical formulas; this principle was used by J. J. Berzelius in determining chemical formulas and combining weights. See polymorphism ; mineral ; crystal .

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isomorphous

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

isomorphous Applied to two compounds having the same, or nearly the same, crystal form and containing ions of approximately the same size or relative size. Isomorphous compounds may show solid solution. Compare ISOTYPIC.

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AILSA ALLABY and MICHAEL ALLABY. "isomorphous." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "isomorphous." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 27, 2009). http://www.encyclopedia.com/doc/1O13-isomorphous.html

AILSA ALLABY and MICHAEL ALLABY. "isomorphous." A Dictionary of Earth Sciences. 1999. Retrieved November 27, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-isomorphous.html

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isomorphism

A Dictionary of Nursing | 2008 | Â© A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

isomorphism (I-soh-mor-fizm) n. the condition of two or more objects being alike in shape or structure.
—isomorphic, isomorphous adj.

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