| 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 (IMA symbol: Amk) is a semi transparent yellow-green hydroxide mineral belonging to the brucite group that was discovered in 1962. Its chemical formula is written as (Fe,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:
- 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 is slightly magnetic and was named for the Amakin Expedition, which prospected the diamond deposits of Yakutia in the Russian Far East.
References
- Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Hey, M. H. (December 1964). "Twenty-third list of new mineral names". Mineralogical Magazine and Journal of the Mineralogical Society. 33 (267): 1125–1160. Bibcode:1964MinM...33.1125H. doi:10.1180/minmag.1964.033.267.08. ISSN 0369-0148.
- Kozlov I.T. and Levshov P.P. (1962). "Amakinite". euromin.w3sites.net. Retrieved 26 December 2022.
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