General Information:
Chemical Formula:
Na4BaTi2O2[B2Si10O28]
Composition:
(Molecular Weight = 1,107.50 gm)
Barium 12.40 % Ba
Sodium 8.30 % Na
Titanium 8.65 % Ti
Silicon 25.36 % Si
Boron 1.95 % B
Oxygen 43.34 % O
Empirical Formula:
Na4BaTi2B2Si10O30
Environment:
Found in the Tertiary-aged Green River Formation, Utah, USA.
Locality:
Narsarsuk, Julianehaab district, Southern Greenland.
Name Origin:
Named in 1901 by Flink from the Greek for white (=leuco) and wedge (=sphen), in allusion to its color and morphology.
Physical Properties:
Cleavage:
[010] Perfect, [001] Fair
Color:
colorless, lemon yellow, brown, or pale blue.
Density:
3 - 3.09, Average = 3.04
Diaphaniety:
Transparent to translucent
Habits:
Wedge shaped - Crystals shaped like a wedge., Pseudo Hexagonal - Crystals show a hexagonal outline., Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Fluorescent, Short UV=yellowish white.
Luster:
Vitreous (Glassy)
Streak:
white
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