Mineral Information and Data:

Bamfordite
Fe3+Mo2O6(OH)3 • H2O [CNMNC approved formula]

Named for the locality: Bamford Hill W-Mo-Bi deposits, 85 km WSW of Cairns, northern Queensland, Australia.

IMA status : Approved Species 1996 (IMA1996-059)
CLASSIFICATION 
Dana
(8th edition) :
49.03.07.01  (This Dana# Added)
  (49) Basic and Hydrated Molybdates and Tungstates
  (49.03) (Hydrated, containing Hydroxyl or Halogen)
  (49.03.07)
  
Nickel-Strunz
(10th edition) :
04.FK.05
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FK) Hydroxides with H2O +- (OH); chains of edge-sharing octahedra
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 5.889(5) Å, b = 7.545(5) Å, c = 9.419(5) Å; a = 71.46(4)°, b = 83.42(4), g= 72.78(4)°, Z = 2
Crystal Habit: As tabular, diamond-shaped crystals, to 0.05 mm, showing {001}, {100}, {010}, {110}, {110}, in aggregates.
  
Color: Bright apple-green with slight yellowish tinge.
Diaphaneity: Transparent
Hardness (Mohs): 2 - 3
Measured Density: 3.620(8) g/cm3
Cleavage: {100}, traces
Tenacity: Compact to friable in aggregates
  
Geologic Setting: Formed in miarolitic cavities and vugs by oxidation of molybdenite under strongly acidic conditions in a W–Mo–Bi deposit.
Mineral Association: W–Mo–Bi oxides, “clay”, muscovite, quartz
  

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