Gismondine is a mineral with the chemical formula CaAl2Si2O8·4(H2O). It is a zeolite or hydrated alumino-silicate. It forms colorless, bipyramidal crystals of orthorhombic symmetry. Gismondine was named for Italian mineralogist Carlo Giuseppe Gismondi (1762-1824). It has been found in Iceland, Ireland, and Italy. ...
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• (n.) Alt. of Gismondite
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rare mineral in the zeolite family. Many specimens have been found in Ireland and Iceland in basaltic lavas, along with such other zeolites as ...
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http://www.britannica.com/eb/a-z/g/34
Gismondine, named after it's discoverer, Gismondi, is a native hydrated silicate of alumina, lime, and potash, first noticed near Rome.
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http://www.probertencyclopaedia.com/browse/HG.HTM
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