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Arakiite (Arakiit)

Collectors Summary

Color rötlichbraun, orangebraun, farblos
Streak color blass braun
Hardness (Mohs) 3.00 - 4.00
Cleavages vollkommen {001}
Fracture uneben, meist halbmuschelig
Solubility H2O
Crystal System monoklin, Cc

Chemism

Chemical formula

ZnMn2+12Fe3+2(As3+O3)(As5+O4)2(OH)23

Chemical composition

Arsen, Eisen, Mangan, Zink, Sauerstoff, Wasserstoff

Unit weight: 1628.2846058 u; Number of atoms in the formula: 75

Info

Empirical formula:

ZnMn12Fe2(AsO3)(AsO4)2(OH)23

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.42

23

30.67

1.0079470

23.1827810
Oxygen

O

33.41

34

45.33

15.9994300

543.9806200
Manganese

Mn

40.49

12

16.00

54.9380499

659.2565988
Iron

Fe

6.86

2

2.67

55.8452000

111.6904000
Zinc

Zn

4.02

1

1.33

65.4094000

65.4094000
Arsenic

As

13.80

3

4.00

74.9216020

224.7648060

Strunz 9th edition incl. updates

8.BE.45

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
E: Mit ausschließlich mittelgroßen [Kationen] (OH, etc.):RO4 > 2:1
45:Hämatolith-Gruppe

Lapis Classification

VII/B.19-005

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
19: Mittelgroße Kationen: Mg-Mn-Fe-Cu-Zn

Classification by Hölzel

8.BG.230

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
G: Phosphates, C medium, without OH
2: With other complex Anions

Dana 8th edition

46.02.08.02

46: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
02: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites with miscellaneous formulae
08: Dixenite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

rötlichbraun, orangebraun, farblos

Streak color

blass braun

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.027
Birefringence chart\! Arakiite title=Birefringence chart Arakiite

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

1.723

RI value β

1.744

RI value γ / ε

1.750

Ri mean

1.739

2V angle

Biaxial (-) 44° (gemessen)

Orientation

Y = b, X ^ c = 4°

Dispersion

Moderat, r > v

Pleochroism

nicht beobachtet

Crystallography

Crystal System

monoklin

Class (H-M)

m

Space Group number

9

Space Group

Cc

Cell parameters a (Å)

14.236

Cell parameters b (Å)

8.206

Cell parameters c (Å)

24.225

Cell parameters a/b or c/a

1.735

Cell parameters c/b

2.952

Cell parameters α

90°

Cell parameters β

93.52

Cell parameters γ

90°

Z

4

Volumne (ų)

2824.64

X-Ray Powder Diffraction

12.07(100),
6.05(100),
4.119(30),
4.040(90),
3.148(30),
3.030(70),
2.411(40),
1.552(70)
XRD chart Arakiite

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)

3.00 - 4.00

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.467 (berechnet)

3.829 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

uneben, meist halbmuschelig

Tenacity

spröde

Instability

H2O

(Co-)Type locality

(Co-)Type locality

Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte

Type material

Western Australian Museum, Perth, Australien

Collection number of type material

MDC5901

Preface

Associations

Calcit, Hämatit, Magnussonit

Name from

Dr. Takahuru Araki (geb. 1929), der zahlreiche Strukturuntersuchungen, u.a. von Arseniten und Arsenaten durchführte

Author (Name, Year)

Roberts & Cooper & Hawthorne & Grice & Feingloss, 2000

References

Mineralogical Record 31 (2000), 253

Canadian Mineralogist 37 (1999), 1471

Other languages

German

Arakiit

French

Arakiite

English

Arakiite

Spanish

Arakiíta

Russian

Аракиит

CNMNC (IMA)-Number

IMA 1998-062

CNMNC symbol

Symbol

Ark

Locations with GPS information