General Information:
Chemical Formula:
(Ce,La)(Y,U)(Ti,Fe+++)20O38
Composition:
(Molecular Weight = 1,871.41 gm)
Lanthanum 1.86 % La
Cerium 5.62 % Ce
Yttrium 3.56 % Y
Uranium 3.18 % U
Titanium 38.38 % Ti
Iron 14.92 % Fe
Oxygen 32.49 % O
Empirical Formula:
Ce0.75La0.25Y0.75U0.25Ti15Fe3+5O38
Environment:
In pegmatites.
IMA Status:
Approved IMA 1987
Locality:
Tuftane, Iveland, Norway.
Name Origin:
Named for its composition and for Tenatt William Edgeworth David (1858-1934), Australian geologist.
Physical Properties:
Cleavage:
None
Color:
brown, brownish black, red, or black.
Density:
4.42 - 4.46, Average = 4.43
Diaphaniety:
Opaque
Habits:
Tabular - Form dimensions are thin in one direction., Pyramidal - Crystals are shaped like pyramids., Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Hardness:
6 - Orthoclase
Luster:
Vitreous - Metallic
Streak:
grayish black
More details...