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Amakinite

Formula:
(Fe
2+
 
,Mg)(OH)
 
2
System:TrigonalColour:Pale green to ...
Hardness:3½ - 4
Name:For the Amakin Expedition, which prospected the Yakutian diamond deposits.


Brucite Group

Classification of Amakinite

IMA status:Approved
Strunz 8th edition ID:4/F.03-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:6.2.1.2

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
Hey's CIM Ref.:7.20.10

7 : Oxides and Hydroxides
20 : Oxides of Fe
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Type Occurrence of Amakinite

Type Locality:Udachnaya-Vostochnaya pipe, Daldyn, Daldyn-Alakit kimberlite field, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia
General Appearance of Type Material:rhombohedra to 1.5 cm; typically in irregular grains
Year of Discovery:1962
Geological Setting of type material:in a drill core, in thin veins and pockets in kimberlite

Physical Properties of Amakinite

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

Crystallography of Amakinite

Crystal System:Trigonal
Cell Parameters:a = 6.917Å, c = 14.52Å
Ratio:a:c = 1 : 2.099
Unit Cell Volume:V 601.63 ų (Calculated from Unit Cell)
Z:12
Morphology:Rhombohedra {10_11}, modified by {10_12}, {10_14}, {11_23}, {20_25} and {0001}
X-Ray Powder Diffraction:
d-spacingIntensity
2.30 (10)
1.728 (9)
2.80 (8)
1.530 (8)
5.49 (7)
1.551 (7)
Comments:Material from the type locality

Optical Data of Amakinite

Type:Uniaxial (+)
RI values: nω = 1.707 nε = 1.722
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Amakinite

Formula:
(Fe
2+
 
,Mg)(OH)
 
2
Essential elements:Fe, H, O
All elements listed in formula:Fe, H, Mg, O
Analyical Data:Analytical results of material from the type locality
SiO2 (0.43)
Al2O3 (0.32)
Fe2O3 (31.58)
FeO (30.40)
MnO (3.63)
MgO (10.10)
H2O (22.95)
CO2 (0.32)

sum 99.91 wt.-%
Empirical Formula:
(Fe
 
0.73
Mg
 
0.22
Mn
 
0.05
)
 
=1.00
(OH)
 
2

Relationship of Amakinite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.FE.05Brucite
Mg(OH)
 
2
4.FE.05Portlandite
Ca(OH)
 
2
4.FE.05Pyrochroite
Mn(OH)
 
2
4.FE.05Theophrastite
Ni(OH)
 
2
4.FE.10Bayerite
Al(OH)
 
3
4.FE.10Doyleite
Al(OH)
 
3
4.FE.10Gibbsite
Al(OH)
 
3
4.FE.10Nordstrandite
Al(OH)
 
3
4.FE.15Böhmite
AlO(OH)
4.FE.15Lepidocrocite
γ-Fe
3+
 
O(OH)
4.FE.20Grimaldiite
CrO(OH)
4.FE.20Heterogenite
CoO(OH)
4.FE.25Feitknechtite
Mn
3+
 
O(OH)
4.FE.25Lithiophorite
(Al,Li)MnO
 
2
(OH)
 
2
4.FE.30Quenselite
PbMnO
 
2
(OH)
4.FE.35Ferrihydrite
Fe
 
5
O
 
3
(OH)
 
9
4.FE.40Feroxyhyte
Fe
3+
 
O(OH)
4.FE.40Vernadite
(Mn
4+
 
,Fe
3+
 
,Ca,Na)(O,OH)
 
2
 · nH
 
2
O
4.FE.45Quetzalcoatlite
Zn
 
6
Cu
 
3
(TeO
 
6
)
 
2
(OH)
 
6
·Ag
 
x
Pb
 
y
Cl
 
x+2y
Related Minerals - Hey's Index Grouping:
7.20.1Wüstite
FeO
7.20.2Magnetite
Fe
2+
 
Fe
3+
2
O
 
4
7.20.3Maghemite
Fe
 
2
O
 
3
7.20.4Hematite
Fe
 
2
O
 
3
7.20.5Goethite
α-Fe
3+
 
O(OH)
7.20.6Akaganeite
β-Fe
3+
 
O(OH,Cl)
7.20.7Feroxyhyte
Fe
3+
 
O(OH)
7.20.8Lepidocrocite
γ-Fe
3+
 
O(OH)
7.20.9Ferrihydrite
Fe
 
5
O
 
3
(OH)
 
9
7.20.11Magnesioferrite
MgFe
3+
2
O
 
4
7.20.12Muskoxite
Mg
 
7
Fe
 
4
O
 
13
·10H
 
2
O
7.20.13Srebrodolskite
Ca
 
2
Fe
 
2
O
 
5
7.20.14Hercynite
FeAl
 
2
O
 
4
7.20.15Brownmillerite
Ca
 
2
(Al,Fe
3+
 
)
 
2
O
 
5

Other Names for Amakinite

German names:
Amakinit
Russian names:
Амакинит
Spanish names:
Amakinita

Other Information

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

References for Amakinite

Reference List:Kozlov, I. T. and Lershov, P. P. (1962): Amakinite, a new mineral of the brucite-pyrochroite group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 91, 72-77 (in Russian). - American Mineralogist (1962), 47, 1218 (abstract).

Sviridov, V. F. and Yakovlevskaya, T. A. (1973): New data on amakinite from the kimberlitic pipe "Udachnaya". Izv. Akad. Nauk SSSR, Ser. Geol. 10, 144-147 (in Russian).

Lutz, H. D., Möller, H. and 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.

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    Localities for Amakinite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Bavaria
      • Lower Bavaria
        • Bavarian Forest
          • Zwiesel
            • Bodenmais
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Daldyn-Alakit kimberlite field
          • Daldyn
    		No reference listed
    Mineral and/or Locality
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