General Information:
Chemical Formula:
(Ca,Na)2(Fe++,Fe+++,Ti,Mg,Mn)6(Si,Be,Al)6O20
Composition:
(Molecular Weight = 837.17 gm)
Sodium 1.37 % Na
Calcium 7.18 % Ca
Magnesium 1.45 % Mg
Titanium 5.15 % Ti
Manganese 0.66 % Mn
Beryllium 1.94 % Be
Aluminum 1.93 % Al
Iron 30.02 % Fe
Silicon 12.08 % Si
Oxygen 38.22 % O
Empirical Formula:
Ca1.5Na0.5Fe2+3Fe3+1.5Ti0.9Mg0.5Mn2+0.1Si3.6Be1.8Al0.6O
IMA (SO4)2(OH)2·7(H2O)
Composition:
(Molecular Weight = 463.94 gm)
Iron 24.07 % Fe
Hydrogen 3.48 % H
Sulfur 13.82 % S
Oxygen 58.63 % O
Empirical Formula:
Fe3+2(SO4)2(OH)2·7(H2O)
Physical Properties:
Cleavage:
[???] Perfect, [???] Imperfect
Color:
brown, orange brown, or reddish brown.
Density:
2.2
Diaphaniety:
Transparent to Translucent
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
orange
More details...