Gismondine
A variety of Minerals
What is 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. Gismondine was named for Italian mineralogist Carlo Giuseppe Gismondi (1762–1824). It has been found in Iceland, Ireland, and Italy.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Gismondine before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Gismondine Localities Map
See where Gismondine is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
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