General Information:
Chemical Formula:Na4BaTi2O2[B2Si10O28]
Composition:(Molecular Weight = 1,107.50 gm)Barium 12.40 %
BaSodium 8.30 %
NaTitanium 8.65 %
TiSilicon 25.36 %
SiBoron 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
More details...
