Bafertisite

General Information:
 Chemical Formula:
Ba(Fe++,Mn)2TiSi2O7(O,OH)2
 Composition:
(Molecular Weight = 497.12 gm)
Barium 27.62 % Ba
Titanium 9.63 % Ti
Manganese 5.53 % Mn
Iron 16.85 % Fe
Silicon 11.30 % Si
Hydrogen 0.10 % H 
Oxygen 28.97 % O 
 Empirical Formula:
BaFe2+1.5Mn2+0.5TiSi2O8.5(OH)0.5
 Environment:
Alkaline igneous rocks.
 Locality:
Bayan Obo REE deposit, Inner Mongolia, Juangsu Province, China.
 Name Origin:
Named for the compostition (Ba, ferrous, Ti, Si).
Physical Properties:
 Cleavage:
[001] Perfect, [010] Poor
 Color:
red, yellowish red, or light brown.
 Density:
3.96 - 4.25, Average = 4.1
 Diaphaniety:
Translucent
 Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
 Hardness:
5 - Apatite
 Luster:
Vitreous (Glassy)
 Streak:
white
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