{{Short description|Hydroxide mineral}} {{Infobox mineral | name = Amakinite | boxwidth = | boxbgcolor = | image = Amakinite.jpg | imagesize = | alt = photo of Amakinite | caption = Amakinite | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = | IMAsymbol = Amk | molweight = | strunz = | dana = | system = Trigonal | class = | symmetry = | unit cell = | color = Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3 | colour = | habit = | twinning = | cleavage = Poor/Indistinct | fracture = Irregular/Uneven | tenacity = | toughness = | mohs = 3.5-4 | luster = | streak = | diaphaneity = | gravity = 2.925 - 2.98 | density = | polish = | opticalprop = Uniaxial | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Amakinite''' (IMA symbol: Amk<ref>{{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}}</ref>) 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<sup>2+</sup>,Mg)(OH)<sub>2</sub>. 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,<ref name="Hey_1964">{{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 = }}</ref> which prospected the diamond deposits of Yakutia in the Russian Far East.<ref name="Euromin">{{Cite web |title=Amakinite |author=Kozlov I.T. and Levshov P.P. |work=euromin.w3sites.net |date=1962 |access-date=26 December 2022 |url= https://euromin.w3sites.net/mineraux/AMAKINITE.html |language=En}}</ref>{{When|date=December 2022}}
==References== {{reflist}}
* [https://www.handbookofmineralogy.org/pdfs/amakinite.pdf www.handbookofmineralogy.org] * [https://webmineral.com/data/Amakinite.shtml webmineral.com] * [http://www.mindat.org/min-180.html www.mindat.org]
Category:Oxide minerals Category:Trigonal minerals Category:Minerals in space group 166
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