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Amakinite

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Formula:
(Fe2+,Mg)(OH)2
Colour:
Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3
Hardness:
3½ - 4
Specific Gravity:
2.925 - 2.98
Crystal System:
Trigonal
Member of:
Name:
For the Amakin Expedition, which prospected the Yakutian diamond deposits.
This page provides mineralogical data about Amakinite.


Hide all sections | Show all sections

Classification of AmakiniteHide

Approved
4.FE.05

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
6.2.1.2

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
7.20.10

7 : Oxides and Hydroxides
20 : Oxides of Fe

Physical Properties of AmakiniteHide

Transparency:
Translucent
Colour:
Pale green to yellow-green; rapidly turns brown when exposed to air, due to formation of Fe(OH)3
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Poor/Indistinct
observed in some grains
Fracture:
Irregular/Uneven
Density:
2.925 - 2.98 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

Optical Data of AmakiniteHide

Type:
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:
High

Chemical Properties of AmakiniteHide

Formula:
(Fe2+,Mg)(OH)2
IMA Formula:
Fe2+(OH)2

Crystallography of AmakiniteHide

Crystal System:
Trigonal
Cell Parameters:
a = 6.917 Å, c = 14.52 Å
Ratio:
a:c = 1 : 2.099
Unit Cell V:
601.63 ų (Calculated from Unit Cell)
Z:
12
Morphology:
Rhombohedra {1011}, modified by {1012}, {1014}, {1123}, {2025} and {0001} to 2 cm; typically in irregular grains.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.30 (10)
1.728 (9)
2.80 (8)
1.530 (8)
5.49 (7)
1.551 (7)
1.386 (7)
Comments:
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

German:Amakinit
Simplified Chinese:羟铁矿
Spanish:Amakinita

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)

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.10DoyleiteAl(OH)3Tric.
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.20GrimaldiiteCrO(OH)Trig.
4.FE.20HeterogeniteCo3+O(OH)Hex.
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.35FerrihydriteFe3+10O14(OH)2Trig.
4.FE.40FeroxyhyteFe3+O(OH)Hex.
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

6.2.1.1BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
6.2.1.3PyrochroiteMn(OH)2Trig. 3m (3 2/m)
6.2.1.4PortlanditeCa(OH)2Trig. 3m (3 2/m)
6.2.1.5TheophrastiteNi(OH)2Trig. 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
7.20.3MaghemiteFe3+2O3Iso. 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
7.20.7FeroxyhyteFe3+O(OH)Hex.
7.20.8Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21
7.20.9FerrihydriteFe3+10O14(OH)2Trig.
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.
France
 
  • 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).
Germany
 
  • Bavaria
    • Lower Bavaria
      • Bodenmais
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Russia (TL)
 
  • Eastern-Siberian Region
    • Sakha Republic (Saha Republic; Yakutia)
      • Daldyn-Alakit kimberlite field
        • 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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