General Information:
Chemical Formula:
(Ba,Sr)Al2Si6O16·5(H2O)
Composition:
(Molecular Weight = 693.44 gm)
Barium 14.85 % Ba
Strontium 3.16 % Sr
Aluminum 7.78 % Al
Silicon 24.30 % Si
Hydrogen 1.45 % H
Oxygen 48.45 % O
Empirical Formula:
Ba0.75Sr0.25Al2Si6O16·5(H2O)
Environment:
Secondary mineral in metamorphosed calc-silicates.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Discovered at the No. 4 wollastonite mine of the Gouverneur Talc Co., near Harrisville, Lewis County, New York, U.S.A.
Name Origin:
Named after David Brewster (1781-1868), Scottish physicist, who studied the optical properties of minerals and the element Strontium. The Ba-dominant member of the brewsterite serie s.
Physical Properties:
Color:
white or colorless.
Density:
2.453
Diaphaniety:
Transparent
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
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