Gismondine
(repeating unit)CaAl2Si2O8·4(H2O) Dana classification 77.1.3.1 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/n
(same H-M symbol)
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.
References
- Encyclopædia Britannica online entry
- Gismondine data at webmineral.com
External links
- Structure type GIS
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