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