General Information:
Chemical Formula:
(La,Ce,Ca)(Y,U)(Ti,Fe+++)20O38
Composition:
(Molecular Weight = 1,860.86 gm)
Calcium 0.22 % Ca
Lanthanum 5.23 % La
Cerium 1.51 % Ce
Yttrium 3.58 % Y
Uranium 3.20 % U
Titanium 38.59 % Ti
Iron 15.01 % Fe
Oxygen 32.67 % O
Empirical Formula:
La0.7Ce0.2Ca0.1Y0.75U0.25Ti15Fe3+5O38
Environment:
Uranium-rich pegmatites.
IMA Status:
Approved IMA 1987
Locality:
Radium Hill mine, Olary Province, SA, Australia.
Name Origin:
Named for Tenatt William Edgeworth David (1858-1934), Australian geologist.
Physical Properties:
Cleavage:
None
Color:
black, grayish black, brownish black, dark brown, or reddish.
Density:
4.42
Diaphaniety:
Opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Anhedral Grains - Granular minerals without the expression of crystal shapes, Metamict - Mineral originally cryst alline, now amorphous due to radiation d
Hardness:
6 - Orthoclase
Luster:
Vitreous - Metallic
Streak:
brownish black
More details...