General Information:
Chemical Formula:
(Sr,Ba,Ca)Al2Si6O16·5(H2O)
Composition:
(Molecular Weight = 666.32 gm)
Barium 6.18 % Ba
Strontium 7.89 % Sr
Calcium 0.60 % Ca
Aluminum 8.10 % Al
Silicon 25.29 % Si
Hydrogen 1.51 % H
Oxygen 50.42 % O
Empirical Formula:
Sr0.6Ba0.3Ca0.1Al2Si6O16·5(H2O)
Environment:
A hydrothermal mineral occuring in vugs of massive volcanic rocks and in veins.
Locality:
Strontian at Argyleshite, Scotland.
Name Origin:
Named after David Brewster (1781-1868), Scottish physicist, who studied the optical properties of minerals.
Physical Properties:
Cleavage:
[010] Perfect
Color:
white, yellowish white, or gray..
Density:
2.45
Diaphaniety:
Transparent to translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
Hardness:
5 - Apatite
Luminescence:
Fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...