General Information:
Chemical Formula:
Na2B4O5(OH)4·8(H2O)
Composition:
(Molecular Weight = 381.37 gm)
Sodium 12.06 % Na
Boron 11.34 % B
Hydrogen 5.29 % H
Oxygen 71.32 % O
Empirical Formula:
Na2(B4O5)(OH)4·8(H2O)
Name Origin:
From the Arabic buraq, for "white."
Physical Properties:
Cleavage:
[100] Perfect, [110] Perfect
Color:
blue, colorless, green, gray, or gray white.
Density:
1.7 - 1.72, Average = 1.71
Diaphaniety:
Translucent to opaque
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Tabular - Form dimensions are thin in one direction., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
None.
Luster:
Greasy (Oily)
Streak:
white
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