Mineral Information and Data:

Amakinite
Fe2+(OH)2 [CNMNC approved formula]

Named for the Amakin Expedition, which prospected the Yakutain diamond deposits.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
06.02.01.02  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.02) where X++ (OH)2
  (06.02.01) Brucite group (Rhombohedral: P-3m1)
  
Nickel-Strunz
(10th edition) :
04.FE.05
  (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: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 6.917 Å, c = 14.52 Å
Crystal Habit: Crystals as well-formed rhombohedrons, rare; typically in irregular grains
  
Color: Pale green to yellow-green, rapidly turns brown upon exposure to air due to the formation of Fe(OH)3
Diaphaneity: Semi-transparent
Luster: Pearly
Hardness (Mohs): 3.5 - 4
Measured Density: 2.92-2.98 g/cm3
Cleavage: Poor, observed in some grains
Fracture: Irregular
  
Geologic Setting: Noted in drill core, in thin veins and pockets in kimberlite.
Mineral Association: Serpentine, carbonate
  
Comments: Member of Brucite group.

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