Amakinite Mineral Data

Amakinite Mineral Data +

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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.

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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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Help on Above

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Amakinite

Electron Density:

r_electron=2.91 gm/cc
note: r_Amakinite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.01594
Boson Index = 0.98406

Photoelectric:

PE_Amakinite= 15.67 barns/electron
U=PE_Amakinite x r_electron= 45.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Amakinite is Not Radioactive

Amakinite Classification

Dana Class:

6.2.1.2 (6)Hydroxides and Oxides Containing Hydroxyl

(6.2)where X++ (OH)2

(6.2.1)Brucite group (Rhombohedral: P3¯m1)

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

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

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

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

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

Strunz Class:

IV/F.03-20 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.03 - Brucite series

IV/F.03-10 Brucite Mg(OH)2 P 3m1 3 2/m

IV/F.03-20 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

IV/F.03-30 Pyrochroite Mn(OH)2 P 3m1 3 2/m

IV/F.03-40 Theophrastite Ni(OH)2 P 3m1 3 2/m

IV/F.03-50 Paraotwayite Ni(OH)2-x(SO4,CO3)0.5xx=.5 Pm m

IV/F.03-60 Sweetite Zn(OH)2 P 4₁2₁2,P 4₃2₁2 4 2 2

IV/F.03-70 Ashoverite Zn(OH)2 I 4₁/amd 4/m 2/m 2/m

IV/F.03-80 Wulfingite Zn(OH)2 P 2₁2₁2₁ 2 2 2

IV/F.03-90 Spertiniite Cu(OH)2 C mc2₁ mm2

IV/F.03-100 Portlandite Ca(OH)2 P 3m1 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Amakinite

(Fe++,Mg)(OH)2
Dana No: 6.2.1.2 Strunz No: IV/F.03-20
Locality:

Notes: