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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.


  • Encyclopedia Britannica online entry
  • Gismondine data at
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gismondine". A list of authors is available in Wikipedia.
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