Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Amakinite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
(Fe2+,Mg)(OH)2
System:
Trigonal
Colour:
Pale green to ...
Hardness:
3½ - 4
Name:
For the Amakin Expedition, which prospected the Yakutian diamond deposits.
Brucite Group

Classification of Amakinite

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
mindat.org URL:
http://www.mindat.org/min-180.html
Please feel free to link to this page.

Type Occurrence of Amakinite

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.
Year of Discovery:
1962
Geological Setting of Type Material:
in a drill core, in thin veins and pockets in kimberlite
Associated Minerals at Type Locality:

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:
2.925 - 2.98 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

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 {1011}, modified by {1012}, {1014}, {1123}, {2025} and {0001} to 2 cm; typically in irregular grains.
X-Ray 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

Optical Data of Amakinite

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 Amakinite

Formula:
(Fe2+,Mg)(OH)2
Essential elements:
All elements listed in formula:
Analytical 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:
(Fe0.73Mg0.22Mn0.05)=1.00(OH)2

Relationship of Amakinite to other Species

4.FE.05BruciteMg(OH)2
4.FE.05PortlanditeCa(OH)2
4.FE.05PyrochroiteMn(OH)2
4.FE.05TheophrastiteNi(OH)2
4.FE.10BayeriteAl(OH)3
4.FE.10DoyleiteAl(OH)3
4.FE.10GibbsiteAl(OH)3
4.FE.10NordstranditeAl(OH)3
4.FE.15BöhmiteAlO(OH)
4.FE.15Lepidocrociteγ-Fe3+O(OH)
4.FE.20GrimaldiiteCrO(OH)
4.FE.20HeterogeniteCoO(OH)
4.FE.25FeitknechtiteMn3+O(OH)
4.FE.25Lithiophorite(Al,Li)MnO2(OH)2
4.FE.30QuenselitePbMnO2(OH)
4.FE.35FerrihydriteFe103+O14(OH)2
4.FE.40FeroxyhyteFe3+O(OH)
4.FE.40Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O
4.FE.45QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y
7.20.1WüstiteFeO
7.20.2MagnetiteFe2+Fe23+O4
7.20.3MaghemiteFe23+O3
7.20.4HematiteFe2O3
7.20.5Goethiteα-Fe3+O(OH)
7.20.6Akaganeiteβ-Fe3+O(OH,Cl)
7.20.7FeroxyhyteFe3+O(OH)
7.20.8Lepidocrociteγ-Fe3+O(OH)
7.20.9FerrihydriteFe103+O14(OH)2
7.20.11MagnesioferriteMgFe23+O4
7.20.12MuskoxiteMg7Fe4O13 · 10H2O
7.20.13SrebrodolskiteCa2Fe23+O5
7.20.14HercyniteFe2+Al2O4
7.20.15BrownmilleriteCa2(Al,Fe3+)2O5

Other Names for Amakinite

Name in Other Languages:
German:Amakinit
Simplified Chinese:羟铁矿
Spanish:Amakinita

Other Information

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 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.

Internet Links for Amakinite

Localities for Amakinite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
      • 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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: May 30, 2015 15:43:48 Page generated: May 27, 2015 23:14:41