Amakinite Mineral Data

General Amakinite Information

Chemical Formula:

(Fe++,Mg)(OH)2

Composition:

Molecular Weight = 83.46 gm

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 % H₂O

Oxygen 38.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.7Mg_0.2Mn²⁺_0.1(OH)₂

Environment:

Noted in a drill core as thin veins and pockets in kimberlite.

IMA Status:

Approved IMA 1962

Locality:

Lucky Eastern kimberlite pipe, [Udachnaya pipe, Daldyn-Alakit region, Yakutia], Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the Amakin Expedition, which prospected the Yakutain diamond deposits.

Name Pronunciation:

Amakinite + Pronunciation

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Amakinite Crystallography

Axial Ratios:

a:c = 1:2.09917

Cell Dimensions:

a = 6.917, c = 14.52, Z = 12; V = 601.63 Den(Calc)= 2.76

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.3(1), 1.728(0.9), 2.8(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium iodide structure

Physical Properties of Amakinite

Cleavage:

{???} Indistinct

Color:

Yellow green, Light green.

Density:

2.925 - 2.98, Average = 2.95

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Pearly

Magnetism:

Weakly magnetic

Optical Properties of Amakinite

Gladstone-Dale:

CI meas= -0.086 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.162 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2589,KPDmeas= 0.242,KC= 0.2227
Ncalc = 1.61 - 1.66

Optical Data:

Uniaxial (+), w=1.707, e=1.722, bire=0.0150.

Calculated Properties of Amakinite

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Amakinite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Amakinite= 15.67 barns/electron
U=PE_Amakinite x rElectron Density= 45.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Amakinite is Not Radioactive

Amakinite Classification

Dana Class:

06.02.01.02 (06)Hydroxides and Oxides Containing Hydroxyl

(06.02)where X++ (OH)2

(06.02.01)Brucite group (Rhombohedral: P-3m1)

06.02.01.01 Brucite Mg(OH)2 P 3m1 3 2/m

06.02.01.02 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

06.02.01.03 Pyrochroite Mn(OH)2 P 3m1 3 2/m

06.02.01.04 Portlandite Ca(OH)2 P 3m1 3 2/m

06.02.01.05 Theophrastite Ni(OH)2 P 3m1 3 2/m

Strunz Class:

04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra

04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m

04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m

04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m

04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m

04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m

Other Amakinite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Amakinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Amakinite Specimen Label here :

Amakinite

(Fe++,Mg)(OH)2
Dana No: 06.02.01.02 Strunz No: 04.FE.05
Locality:

Notes: