Davidite-(La)

General Information: Chemical Formula:(La,Ce,Ca)(Y,U)(Ti,Fe+++)20O38 Composition:(Molecular Weight = 1,860.86 gm)Calcium 0.22 % CaLanthanum 5.23 % LaCerium 1.51 % CeYttrium 3.58 % Y Uranium 3.20 % U Titanium 38.59 % TiIron 15.01 % FeOxygen 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 blackMore details...