Amakinite Explained

Amakinite
Imasymbol:	Amk
System:	Trigonal
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:	3.5-4
Gravity:	2.925 - 2.98
Opticalprop:	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:

• 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%
• 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]

References

• www.handbookofmineralogy.org
• webmineral.com
• www.mindat.org

Notes and References

1. Warr. L.N.. 2021. IMA-CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
2. Hey . M. H. . Twenty-third list of new mineral names . Mineralogical Magazine and Journal of the Mineralogical Society . December 1964 . 33 . 267 . 1125–1160 . 0369-0148 . 10.1180/minmag.1964.033.267.08 . 1964MinM...33.1125H .
3. Web site: Amakinite . Kozlov I.T. and Levshov P.P. . euromin.w3sites.net . 1962 . 26 December 2022 . En.