Davidite-(La)

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:
(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
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