Billietite

Billietite
Becquerelite (yellow) and billietite (orange)
General
Category Oxide minerals
Formula
(repeating unit)		 Ba(UO2)6O4(OH)6•8H2O
Strunz classification 4.GB.10
Dana classification 5.7.1.3
Crystal system Orthorhombic
Crystal class Pyramidal (mm2)
(same H-M symbol)
Space group Pbn21
Identification
Color Yellow to golden-yellow, amber-yellow, orange-yellow
Cleavage Perfect on {001}, imperfect on {110} and {010}
Tenacity Brittle
Luster Adamantine
Diaphaneity Transparent, translucent
Density 5.28 - 5.36 g/cm3
References [1][2]

Billietite is an uncommon mineral of Uranium that contains Barium. It has the chemical formula: Ba(UO2)6O4(OH)6•8H2O. It usually occurs as clear yellow orthorhombic crystals.[3] Billietite is named after Valere Louis Billiet (1903–1944), Belgian crystallographer at the University of Ghent, Ghent, Belgium.

References

  1. ↑ Mineralienatlas
  2. ↑ Mindat.org - Billietite
  3. ↑ M. Katherine Pagoaga, Daniel E, Appleman, & James M. Stewart "Crystal structures and crystal chemistry of the uranyl oxide hydrates becquerelite, billietite, and protasite" American Mineralogist, Volume 72, pages 1230-1238, 1987


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