Gismondine

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.

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Gismondine was named for Italian mineralogist Carlo Giuseppe Gismondi (1762-1824). It has been found in Iceland, Ireland, and Italy.

References

• Encyclopedia Britannica online entry
• Gismondine data at webmineral.com