Mineral Information and Data:

Bauranoite  
BaU2O7 • 4-5H2O [CNMNC approved formula]

Named for BArium and URANium in the composition.

IMA status : Approved Species 1973 (IMA1971-052)
CLASSIFICATION 
Dana
(8th edition) :
05.04.02.02  
  (05) Oxides Containing Uranium and Thorium
  (05.04) with alkaline-earth elements (hydrated)
  (05.04.02) Uranoite Series
  
Nickel-Strunz
(10th edition) :
04.GB.20
  (04) Oxides and Hydroxides
  (04.G) Uranyl Hydroxides
  (04.GB) With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
  
Crystal system: Triclinic System
Point group (H-M): Unknown — Unk
Crystal Habit: As dense, fine-grained aggregates.
  
Color: Reddish brown
Diaphaneity: Semi-transparent
Hardness (Mohs): 5
Measured Density: 5.283 - 5.420 g/cm3
  
Geologic Setting: In the oxidation zone of a U-Mo deposit, replacing "pitchblende" and replaced by uranophane.
Mineral Association: Uraninite, uranophane, calciouranoite, metacalciouranoite, protasite
  
Other Properties: Radioactive.

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