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Mountkeithite (Mountkeithit)

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Mountkeithit
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Mountkeithit
violette Partien von Mountkeithit in Sepentinit, M K D 5 Nickel Lagerstätte, Mount Keith, Wiluna Shire, Western Australia, Australien; BB ~ 5 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Australien/Western Australia/Wiluna Shire/Leinster/Mount Keith
Mineral: Mountkeithite
Image: 1585474432
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Mountkeithit

violette Partien von Mountkeithit in Sepentinit, M K D 5 Nickel Lagerstätte, Mount Keith, Wiluna Shire, Western Australia, Australien; BB 5 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-29
Locality: Mount Keith / Leinster / Wiluna Shire / Western Australia / Australien

Collectors Summary

Color blassrosa
Streak color weiß
Hardness (Mohs) 2
Cleavages vollkommen
Solubility +++ HCl
Crystal System hexagonal,

Chemism

Chemical formula

(Mg,Ni)11(Fe3+,Cr,Al)3(OH)24(SO4,CO3)3.5·11H2O

Chemical composition

Aluminium, Chrom, Eisen, Magnesium, Nickel, Kohlenstoff, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1428.35551621 u; Number of atoms in the formula: 111.625

Info

Empirical formula:

(Mg0.75Ni0.25)11(Fe0.6Cr0.3Al0.1)3(OH)24((SO4)0.75(CO3)0.25)3.5·11H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.25

46

41.21

1.0079470

46.3655620
Carbon

C

0.74

0.88

0.78

12.0107800

10.5094325
Oxygen

O

53.91

48.13

43.11

15.9994300

769.9725688
Magnesium

Mg

14.04

8.25

7.39

24.3050600

200.5167450
Aluminium

Al

0.57

0.3

0.27

26.9815382

8.0944615
Sulfur

S

5.89

2.63

2.35

32.0655000

84.1719375
Chromium

Cr

3.28

0.9

0.81

51.9961600

46.7965440
Iron

Fe

7.04

1.8

1.61

55.8452000

100.5213600
Nickel

Ni

11.30

2.75

2.46

58.6934200

161.4069050

Analysis wt%

MgO : 30.29, NiO : 5.61, Cr2O3 : 5.71, Fe2O3 : 7.20, Al2O3 : 3.07, SO3 : 12.03, CO2 : 4.96, H2O : 31.14 (Ref: berechnet)

Strunz 9th edition incl. updates

7.DD.35

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
D: Sulfate (Selenate, etc.) mit weitere Anionen, mit H2O
D: mit mittelgroßen Kationen; Lagen von kantenverknüpften Oktaedern
35:Woodwardit-Gruppe

Lapis Classification

VI/D.09-030

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
9: Mittelgroße Kationen

Classification by Hölzel

5.DE.100

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
D: Carbonates (+Anions +Water)
E: With other complex Anions

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Hydrotalcite Supergroup  ⇒ Glaucocerinite Group

Optical Properties

Color

blassrosa

Streak color

weiß

max. Birefringence

0.01
Birefringence chart\! Mountkeithite title=Birefringence chart Mountkeithite

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

1.52

RI value γ / ε

1.51

Ri mean

1.517

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Cell parameters a (Å)

10.698

Cell parameters b (Å)

-

Cell parameters c (Å)

22.545

Cell parameters a/b or c/a

2.107

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

2234.529

X-Ray Powder Diffraction

11.30(100),
5.63(80),
4.63(20),
3.765(60),
2.645(40),
2.545(40),
1.554(50),
1.505(30)
XRD chart Mountkeithite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

Density (g/cm³)

2.12 (gemessen)

2.123 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Australien/Western Australia/Wiluna Shire/Leinster/Mount Keith

Preface

Author (Name, Year)

Hudson & Bussell, 1981

References

Mineralogical Magazine 44 (1981), 345

IMA group assignments

Other languages

German

Mountkeithit

Spanish

Mountkeithita

English

Mountkeithite

French

Mountkeithite

CNMNC (IMA)-Number

IMA 1980-038

CNMNC symbol

Symbol

Mke

Locations with GPS information