Mordenite

minerals

glauconite

zeolite

kaolinite

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
Common impurities: Mg
Environments:

Sedimentary environments
Hydrothermal environments

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 (Dana.).
Associated minerals include zeolites, calcite, kaolinite and glauconite (HOM).

Localities

The type locality is at Morden, Kings county, Nova Scotia, Canada.

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