Barytolamprophyllite

General Information:
 Chemical Formula:
Ba2Na3(Fe+++,Ti)3(Si2O7)2(O,OH,F)4
 Composition:
(Molecular Weight = 905.03 gm)
Barium 30.35 % Ba
Sodium 7.62 % Na
Titanium 5.29 % Ti
Iron 12.34 % Fe
Silicon 12.41 % Si
Hydrogen 0.08 % H 
Oxygen 31.38 % O 
Fluorine 0.52 % F 
 Empirical Formula:
Ba2Na3Fe3+2TiSi2O72O3(OH)0.75(F)0.25
 Environment:
Alkalic rocks.
 IMA Status:
Approved IMA 1966
 Locality:
Lovozero massif, Khibiny, Kola, Peninsula, Russia.
 Name Origin:
Named for the composition and similarity to lamprophyllite.
Physical Properties:
 Cleavage:
[100] Perfect, [011] Good, [010] Poor
 Color:
golden brown or dark brown.
 Density:
3.62 - 3.66, Average = 3.64
 Diaphaniety:
Translucent
 Habits:
Flakes - Flat, thin crystals or aggregates., Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.,
 Hardness:
2-3 - Gypsum-Calcite
 Luster:
Vitreous (Glassy)
 Streak:
light brown
More details...