Davidite-(Ce)

Davidite is a mineral which exists in two forms:Davidite-(La) La0.7Ce0.2Ca0.1Y0.75U0.25Ti15Fe3+5O38Synonyms: ICSD: 100554 PDF: 42-576 Discovered at Radium Hill mine, South Australia.
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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
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