General Information:
Chemical Formula:
Y4Fe++Si4O14F2 (?)
Composition:
(Molecular Weight = 785.80 gm)
Yttrium 45.26 % Y
Iron 7.11 % Fe
Silicon 14.30 % Si
Oxygen 28.50 % O
Fluorine 4.84 % F
Empirical Formula:
Y4Fe2+Si4O14F2
Environment:
Associated with gadolinite.
IMA Status:
Approved IMA 1987
Locality:
Llano Co., Texas.
Physical Properties:
Cleavage:
None
Color:
gray white or light green.
Density:
4.5
Diaphaniety:
Transparent to Subopaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
Non-fluorescent.
Streak:
white
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