General Information:
Chemical Formula:
(Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl)
Composition:
(Molecular Weight = 1,595.98 gm)
Potassium 1.47 % K
Barium 25.81 % Ba
Calcium 3.01 % Ca
Beryllium 1.41 % Be
Aluminum 0.34 % Al
Silicon 14.25 % Si
Boron 0.81 % B
Lead 23.37 % Pb
Chlorine 0.56 % Cl
Oxygen 28.07 % O
Fluorine 0.89 % F
Empirical Formula:
Ba3Pb1.8Ca1.2K0.6B1.2Si0.6Al0.2Si7.5Be2.5O28F0.75Cl0.25
Locality:
Langbanshyttan, Vermalnd, Sweden.
Physical Properties:
Cleavage:
[???] Good, [???] Good
Color:
white or pearly gray.
Density:
3.81
Diaphaniety:
Translucent to subtranslucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Crystalline - Coarse - Occurs as well-formed coarse sized crystals.,
Hardness:
5.5 - Knife Blade
Luster:
Vitreous - Adamantine
Streak:
white
More details...