Chemistry:Amakinite

From HandWiki
Short description: Hydroxide mineral
Amakinite
General
CategoryMineral
Crystal systemTrigonal
Identification
ColorPale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3
CleavagePoor/Indistinct
FractureIrregular/Uneven
Mohs scale hardness3.5-4
Specific gravity2.925 - 2.98
Optical propertiesUniaxial

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% H
    2
    O
  • 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

  1. Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W. 
  2. Hey, M. H. (December 1964). "Twenty-third list of new mineral names". Mineralogical Magazine and Journal of the Mineralogical Society 33 (267): 1125–1160. doi:10.1180/minmag.1964.033.267.08. ISSN 0369-0148. 
  3. Kozlov I.T. and Levshov P.P. (1962). "Amakinite" (in En). euromin.w3sites.net. http://euromin.w3sites.net/mineraux/AMAKINITE.html.