Merlinoite

tectosilicate

basaltic cavities

Formula: K5Ca2(Si23Al9)O64.24H2O tectosilicate (framework silicate), zeolite group
Specific gravity: 2.14 to 2.27
Hardness: 4½
Streak: White
Colour: Colourless to white
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.
Common impurities: Fe

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