Mineral Information and Data:

Bayerite
Al(OH)3 [CNMNC approved formula]

Named from the artificial compound thought to have been named for the 19th-century German metallurgist Karl J. Bayer; the name was then applied to the natural mineral.

IMA status : Valid species (Pre-IMA 1928) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
06.03.02.01  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.03) with (OH)3 or (OH)6 groups
  (06.03.02)
  
Nickel-Strunz
(10th edition) :
04.FE.10
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FE) Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/m
Unit cell: a = 5.0626Å, b = 8.6719Å, c = 9.4254Å; β = 90.26°
Crystal Habit: As very fine fibers; also as flaky and tabular crystals, to 0.1 mm; in radiating hemispherical aggregates and crusts.
  
Color: White
Diaphaneity: Semi-transparent
Measured Density: 2.53 g/cm3
  
Polymorphism and Series: Polymorphous with doyleite, gibbsite, and nordstrandite.
Geologic Setting: Probably precipitated from high-aluminum gels on carbonates at pH > 5.8 (Hatrurim Formation, Israel); as weathered crusts on amphiboles and pyroxenes (Dnieper region, Russia); in bauxites.
Mineral Association: Calcite, gypsum, portlandite, ettringite, vaterite, thaumasite (Hatrurim
Formation, Israel)
  

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