Davidite

Davidite is a rare earth oxide mineral with chemical end members La and Ce. It exists in two forms:

Davidite-(La)
Davidite-(La) from Kazakhstan
General
CategoryOxide minerals
Formula
(repeating unit)
(La,Ce,Ca)(Y,U)(Ti,Fe3+
)
20
O
38
Strunz classification4.CC.40
Crystal systemTrigonal
Crystal classRhombohedral (3)
H-M symbol: (3)
Space groupR3
Unit cella = 10.376, c = 20.91 [Ã…]; Z = 3
Identification
ColorBlack
FractureSubconchoidal to uneven
TenacityBrittle
Mohs scale hardness6 [1]
LusterVitreous
DiaphaneityOpaque, translucent in very thin fragments
Specific gravity4.33 to 4.48
Alters toMetamict
Other characteristics Radioactive
References[2][3][4][5]

References

  1. http://www.webmineral.com/data/Davidite-(La).shtml#.XAWfQnWYVhE
  2. Davidite-La in Handbook of Mineralogy
  3. Davidite-La on Mindat
  4. Davidite-(La) on Webmineral
  5. Davidite-(Ce) on Webmineral
  6. Branagan, D.F. (2005): T.W. Edgeworth David: A Life: Geologist, Adventurer and "Knight in the Old Brown Hat", National Library of Australia, Canberra, p. 471. ISBN 0 642 10791 2
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