Mordenite

tectosilicate

volcanic

Formula: (Na2,Ca,K2)4(Al8Si40)O96.28H2O tectosilicate (framework silicate), zeolite group
Specific gravity: 2.10 to 2.15
Hardness: 4 to 5
Streak: White
Colour: Colourless, white, yellow, pink, orange, red
Environments:

Volcanic Igneous environments
Sedimentary environments
Hydrothermal environments
Basaltic cavities

Mordenite occurs in silica rich (eg rhyolitic) volcanics, in volcanic ash beds, tuff, and rarely in olivine-basalt. It is of hydrothermal or sedimentary authigenic (formed in place) origin.
Common impurities: Mg

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