Formula: (Fe,Mg)(OH)2
Origin of name: For the Amakin expedition which prospected the Yakutian diamond deposits, Russia.
Crystal system: Hexagonal
Crystal class: -3 2/m
Unit cell: a = 6.917 Å, c = 14.52 Å
Colour: Pale green to yellow-green, rapidly turns brown upon exposure to air due to the formation of Fe(OH)3
Diaphaneity: Semi-transparent
Habit: Crystals as well-formed rhombohedrons, rare; typically in irregular grains
Hardness: 3.5 to 4
Specific gravity: 2.92-2.98
Cleavage: Poor, observed in some grains
Synonyms/varieties:
Comments: Member of the brucite group. Noted in drill core, in thin veins and pockets in kimberlite.
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