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Formulae:
brewsterite-Ba:
Ba(Al2Si6)O16.5H2O
brewsterite-Sr:
Sr(Al2Si6)O16.5H2O
Tectosilicates (framework silicates), brewsterite subgroup of
the zeolite group
Crystal System: Monoclinic
Environments
Metamorphic environments
Basaltic cavities
Brewsterite is a hydrothermal mineral deposited in druses lining cavities in
basalt and schist; more
rarely
in hydrothermal veins in ore deposits
(HOM, Dana).
Associated minerals include zeolites,
calcite
and quartz
(HOM).
Localities
At the Marron Volcanics of the Olalla Area South-Central British Columbia, Canada, brewsterite casts after
calcite (pseudomorphs) have
been found at Yellow Lake
(KL p268).
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