Amakinite
| 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[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 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?]
References
[edit]- ^ 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.