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Gismondine
Gismondine
is a
mineral
with the
chemical formula
CaAl
2
Si
2
O
8
·4. 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
. It has been found in
Iceland
,
Ireland
, and
Italy
.