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 | |
|---|---|
 Gismondine, Campo de Calatrava, Ciudad Real, Spain | |
| General | |
| Category | Zeolite minerals |
| Formula (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 |
Gismondine was named for Italian mineralogist Carlo Giuseppe Gismondi (1762–1824). It has been found in Iceland, Ireland, and Italy.
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