General Information:
Chemical Formula:
Ca3[B5O6(OH)6](OH)Cl2·8(H2O)
Composition:
(Molecular Weight = 604.36 gm)
Calcium 19.89 % Ca
Boron 8.94 % B
Hydrogen 3.84 % H
Chlorine 11.73 % Cl
Oxygen 55.59 % O
Empirical Formula:
Ca3(B5O6)(OH)6(OH)Cl2·8(H2O)
Environment:
In the lower third of the Upper Halite member of the Mississippian-aged Widsor Group evaporites.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Potash Corporation of Saskatchewan Mine, 5 km east of Penobsquis, Carwell Parish, Kings County, New Brunswick, Canada.
Name Origin:
For Brian V. Roulston (1948-), in recognition of his work on the geology of evaporite deposits.
Physical Properties:
Cleavage:
[010] Perfect
Color:
colorless or white.
Density:
1.97
Diaphaniety:
Transparent to translucent
Habits:
Cleaveable - Easily cleaved into fragments., Micaceous - Platy texture with "flexible" plates.,
Hardness:
5 - Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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