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Amakinite (Amakinit)

Collectors Summary

Color blassgrün
Hardness (Mohs) 3.50 - 4.00
Solubility +++ HCl
Crystal System trigonal, P3m1

Chemism

Chemical formula

Fe(OH)2

Chemical composition

Eisen, Sauerstoff, Wasserstoff

Unit weight: 89.859954 u; Number of atoms in the formula: 5

Info

Empirical formula:

Fe(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.24

2

40.00

1.0079470

2.0158940
Oxygen

O

35.61

2

40.00

15.9994300

31.9988600
Iron

Fe

62.15

1

20.00

55.8452000

55.8452000

Analysis wt%

Fe2O3 : 31.58, FeO : 30.40, MgO : 10.10, MnO : 3.63, SiO2 : 0.43, H2O : 23.03 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 62)

Strunz 9th edition incl. updates

4.FE.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
F: Hydroxide (ohne V oder U)
E: Hydroxide mit OH, ohne H2O; Lagen kantenverknüpfter Oktaeder
05:Brucit-Gruppe

Lapis Classification

IV/F.03-020

IV: OXIDE
F: Hydroxide und oxidische Hydrate (wasserhaltige Oxide mit Schichtstruktur)
3: Brucit-Reihe

Classification by Hölzel

4.FA.180

4: OXIDES
F: Hydroxides and Hydrates (without V and U)
A: Dihydroxides Me(OH)2
1: Brucite-Group

Dana 8th edition

06.02.01.02

06: Hydroxides and Oxides Containing Hydroxyl
02: Hydroxides and Oxides Containing Hydroxyl where X++ (OH)2
01: Brucite group (Rhombohedral: P-3m1)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blassgrün

max. Birefringence

0.015
Birefringence chart\! Amakinite title=Birefringence chart Amakinite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.707

RI value γ / ε

1.722

Ri mean

1.712

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

164

Space Group

P3m1

Cell parameters a (Å)

3.263

Cell parameters b (Å)

-

Cell parameters c (Å)

4.604

Cell parameters a/b or c/a

1.411

Cell parameters c/b

-

Z

1

Volumne (ų)

42.452

X-Ray Powder Diffraction

5.49(70),
2.80(80),
2.30(100),
1.728(90),
1.551(70),
1.530(80),
1.386(70),
1.265(70)
XRD chart Amakinite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.50 - 4.00

VHN (Hardness Vickers)

160 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.98 (gemessen) 3.515 (berechnet)

3.515 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Russland/Ferner Osten, Föderationskreis/Sacha (Sakha, Jakutien, Якутия), Republik/Daldyn-Alakit-Kimberlit-Feld/Daldyn/Udachnaya-Vostochnaya-Schlot

Preface

Author (Name, Year)

Kozlov & Levshov, 1962

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 91 (1962), 72

CNMNC Newsletter No. 50; Mineralogical Magazine, 31 [Formel]

Other languages

German

Amakinit

Spanish

Amakinita

French

Amakinite

English

Amakinite

Russian

Амакинит

Simplified Chinese

羟铁矿

CNMNC symbol

Symbol

Amk

Locations with GPS information