Gismondine is a mineral with the chemical formula CaAl2Si2O8ยท4(H2O). It is a zeolite or hydrated alumino-silicate. It forms colorless, bipyramidal crystals of orthorhombic symmetry. Minerals are natural compounds formed through geological processes. ... Zeolite The micro-porous molecular structure of a zeolite, ZSM-5 Zeolites (Greek, zein,to boil;lithos,a stone) are minerals that have a micro-porous structure. ...
Gismondine was named for Italian mineralogist Carlo Giuseppe Gismondi (1762-1824). It has been found in Iceland, Ireland, and Italy.
In this figure, A is the tracing of a gismondine type composition prepared in Example 2 and represents a prior art zeolite P prepared from metakaolin (COH).
High aluminum versions of gismondine, sometimes referred to as Zeolite MAP, are the newest manifestation of high aluminum zeolite detergent builders.
An XRD powder pattern essentially identical to that of Example 1 and 2 (characteristic of gismondine type zeolites) was obtained.
All gismondines found and studied over almost two centuries were calcium-dominant.
Recently, a barium-dominant gismondine has been discovered in slag material (of course not approved, as valid species, by IMA CNMNC).
Therefore, in keeping with the recommendation of the Zeolite Subcommittee, "gismondine" acquired the status of series, and any individual species has to be denoted now with the suffix for the dominant extra-framework cation (e.g., gismondine-Ca, gismondine-Ba).
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