Tectosilicates (framework silicates)
Specific gravity: 2.32 to 2.45
Streak: Sr White
Colour: Ba: White, Colorless, Pale Pink; Sr: White
Brewsterite is a hydrothermal mineral deposited in druses lining cavities in
basalt and schist; more rarely
in hydrothermal veins in ore deposits
Associated minerals include zeolites, calcite and quartz (HOM).
At Yellow lake, near Ollala, British Columbia, Canada, brewsterite casts after calcite (pseudomorphs) have been found (KL p268).
Brewsterite-Ba has two co-type localities, Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy and Gouverneur Talc Company Number 4 Quarry, Diana Township, Lewis county, New York, USA.
Brewsterite-Sr has its type locality at Strontian, Highland, Scotland, UK.
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