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Formula: K5Ca2(Si23Al9)O64.24H2O
tectosilicate (framework silicate), zeolite group
Crystal System: Orthorhombic
Specific gravity: 2.14 to 2.27 measured, 2.21 calculated
Hardness: 4½
Streak: White
Colour: Colourless to white
Common impurities: Fe
Environments:
Volcanic igneous environments
Pegmatites
Sedimentary environments
Basaltic cavities
Merlinoite is a secondary mineral occuring in cavities in
basalt, in
pegmatites, in pyroxene-rich volcanic ejecta, and as a
diagenetic alteration in volcanic ash falls.
Associated minerals include phillipsite,
apophyllite, chabazite and
calcite.
(HOM).
The type locality is the Cupaello Quarry, Santa Rufina, Rieti, Rieti Province, Lazio, Italy.
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