Amakinite

{{Short description|Hydroxide mineral}}

{{Infobox mineral

| name = Amakinite

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| image = Amakinite.jpg

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| alt = photo of Amakinite

| caption = Amakinite

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| IMAsymbol = Amk

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| system = Trigonal

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| color = Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3

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| cleavage = Poor/Indistinct

| fracture = Irregular/Uneven

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| mohs = 3.5-4

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| gravity = 2.925 - 2.98

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| opticalprop = Uniaxial

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Amakinite (IMA symbol: Amk{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA-CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}) 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|date=December 2022}}

• 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,{{cite journal | last1 = Hey | first1 = M. H. | title = Twenty-third list of new mineral names | journal = Mineralogical Magazine and Journal of the Mineralogical Society | date = December 1964 | volume = 33 | issue = 267 | pages = 1125–1160 | issn = 0369-0148 | doi = 10.1180/minmag.1964.033.267.08 | pmid = | bibcode = 1964MinM...33.1125H | url = }} which prospected the diamond deposits of Yakutia in the Russian Far East.{{Cite web |title=Amakinite |author=Kozlov I.T. and Levshov P.P. |work=euromin.w3sites.net |date=1962 |access-date=26 December 2022 |url= http://euromin.w3sites.net/mineraux/AMAKINITE.html |language=En}}{{When|date=December 2022}}