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Amakinite (IMA symbol: Amk[1]) is a semi transparent yellow-green hydroxide mineral belonging to the brucite group that was discovered in 1962. Its chemical formula is written as (Fe2+,Mg)(OH)2. It usually occurs in the form of splotchy, anhedral crystals forming within a group or structure in other minerals or rocks, such as kimberlite (occurring in diamond-rich eruptive pipe). Its composition is as follows:[citation needed]
- Magnesium 5.82% Mg 9.66% MgO
- Manganese 6.58% Mn 8.50% MnO
- Iron 46.84% Fe 60.26% FeO
- Hydrogen 2.42% H 21.58% H2O
- Oxygen 38.34% O
| Amakinite | |
|---|---|
| General | |
| Category | Mineral |
| IMA symbol | Amk |
| Crystal system | Trigonal |
| Identification | |
| Color | Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3 |
| Cleavage | Poor/Indistinct |
| Fracture | Irregular/Uneven |
| Mohs scale hardness | 3.5-4 |
| Specific gravity | 2.925 - 2.98 |
| Optical properties | Uniaxial |
Amakinite is slightly magnetic and was named for the Amakin Expedition,[2] which prospected the diamond deposits of Yakutia in the Russian Far East.[3][when?]
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