Tectosilicate (framework silicates), zeolite group
Specific gravity: 2.11
Hardness: 4 to 5
Common impurities: Na
Mazzite-(Mg), formerly mazzite, occurs in cavities in porphyritic
olivine basalt, associated with
chabazite, calcite and
siderite (HOM ). It is of hydrothermal origin.
At the type locality, Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France, Mazzite-(Mg) occurs as bundles of needles up to 1.5 mm long but only 20 microns across, in olivine basalt. Associated minerals include phillipsite, offretite, chabazite, calcite and siderite (AM 60.340).
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