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Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3
3½ - 4
Specific Gravity:
2.925 - 2.98
Crystal System:
Member of:
For the Amakin Expedition, which prospected the Yakutian diamond deposits.
This page provides mineralogical data about Amakinite.

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Classification of AmakiniteHide


4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra

2 : X(OH)2

7 : Oxides and Hydroxides
20 : Oxides of Fe

Physical Properties of AmakiniteHide

Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3
3½ - 4 on Mohs scale
observed in some grains
2.925 - 2.98 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

Optical Data of AmakiniteHide

Uniaxial (+)
RI values:
nω = 1.707 nε = 1.722
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of AmakiniteHide

IMA Formula:

Crystallography of AmakiniteHide

Crystal System:
Cell Parameters:
a = 6.917 Å, c = 14.52 Å
a:c = 1 : 2.099
Unit Cell V:
601.63 ų (Calculated from Unit Cell)
Rhombohedra {1011}, modified by {1012}, {1014}, {1123}, {2025} and {0001} to 2 cm; typically in irregular grains.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
2.30 Å(10)
1.728 Å(9)
2.80 Å(8)
1.530 Å(8)
5.49 Å(7)
1.551 Å(7)
1.386 Å(7)
Material from the type locality

Type Occurrence of AmakiniteHide

General Appearance of Type Material:
rhombohedra to 1.5 cm; typically in irregular grains
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 69547.
Geological Setting of Type Material:
in a drill core, in thin veins and pockets in kimberlite
Associated Minerals at Type Locality:

Other Language Names for AmakiniteHide

Simplified Chinese:羟铁矿

Relationship of Amakinite to other SpeciesHide

Member of:
Other Members of this group:
BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
PortlanditeCa(OH)2Trig. 3m (3 2/m)
PyrochroiteMn(OH)2Trig. 3m (3 2/m)
TheophrastiteNi(OH)2Trig. 3m (3 2/m) : P3m1

Related Minerals - Nickel-Strunz GroupingHide

4.FE.05BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
4.FE.05PortlanditeCa(OH)2Trig. 3m (3 2/m)
4.FE.05PyrochroiteMn(OH)2Trig. 3m (3 2/m)
4.FE.05TheophrastiteNi(OH)2Trig. 3m (3 2/m) : P3m1
4.FE.10BayeriteAl(OH)3Mon. 2/m : P21/m
4.FE.10GibbsiteAl(OH)3Mon. 2/m
4.FE.10NordstranditeAl(OH)3Tric. 1 : P1
4.FE.15BöhmiteAlO(OH)Orth. mmm (2/m 2/m 2/m)
4.FE.15Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21
4.FE.25FeitknechtiteMn3+O(OH)Trig. 3m (3 2/m) : P3m1
4.FE.25Lithiophorite(Al,Li)MnO2(OH)2Trig. 3m (3 2/m) : R3m
4.FE.30QuenselitePbMnO2(OH)Mon. 2/m : P2/b
4.FE.40Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2OHex.
4.FE.45QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2yTrig. 3m (3 2/m) : P3m1

Related Minerals - Dana Grouping (8th Ed.)Hide 3m (3 2/m) : P3m1 3m (3 2/m) 3m (3 2/m) 3m (3 2/m) : P3m1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.20.1WüstiteFeOIso. m3m (4/m 3 2/m) : Fm3m
7.20.2MagnetiteFe2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.20.3Maghemite(Fe3+0.670.33)Fe3+2O4Iso. 4 3 2 : P41 3 2
7.20.4HematiteFe2O3Trig. 3m (3 2/m) : R3c
7.20.5Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
7.20.6Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2OMon. 2/m
7.20.8Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21
7.20.11MagnesioferriteMgFe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.20.12MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
7.20.13SrebrodolskiteCa2Fe3+2O5Orth. mmm (2/m 2/m 2/m) : Pnma
7.20.14HercyniteFe2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.20.15BrownmilleriteCa2(Al,Fe3+)2O5Orth. mm2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AmakiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Feitknecht, W., Keller, G. (1950) Über die dunkelgrünen Hydroxyverbindungen des Eisens. Zeitschrift für Anorganische und Allgemeine Chemie: 262: 61-68.
Kozlov, I.T., Lershov, P.P. (1962) Amakinite, a new mineral of the brucite-pyrochroite group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 91: 72-77. [in Russian]
Fleischer M (1962) New mineral names. American Mineralogist: 47: 1216-1223. [abstract]
Sviridov, V.F., Yakovlevskaya, T.A. (1973) New data on amakinite from the kimberlitic pipe "Udachnaya". Izvestiya Akademii Nauk SSSR, Seriya Geologicheskaya: 10: 144-147. [in Russian]
Lutz, H. D., Möller, H., Schmidt, M. (1994) Lattice vibration spectra. Part LXXXII. Brucite-type hydroxides M(OH)2 (M = Ca, Mn, Co, Fe, Cd) - IR and Raman spectra, neutron diffraction of Fe(OH)2. Journal of Molecular Structure: 328: 121-132.
Anthony, J. W., et al. (1997) Handbook of Mineralogy, Vol. 3, 13.

Internet Links for AmakiniteHide

Localities for AmakiniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Ile-de-France
    • Paris
Pignatelli, I. et al. (2016) Multiple precursors of secondary mineralogical assemblages in CM chondrites: Meteoritics & Planetary Science 51(4): 785-805. (April 2016).
  • Bavaria
    • Lower Bavaria
      • Regen
        • Bodenmais
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Russia (TL)
  • Sakha Republic (Yakutia)
    • Mirninsky District
      • Daldyn
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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