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Iowaite (Iowait)

Pictures (2 Images total)

Iowait
Views (File:
1136565405
): 1945
Iowait
Fundort: Palabora mine, Limpopo Province, Süd-Afrika
Copyright: Stephan Wolfsried; Contribution: JHM
Location: Südafrika/Limpopo, Provinz/Mopani, Distrikt/Phalaborwa/Loolekop/Palabora Mine
Mineral: Iowaite
Image: 1136565405
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Iowait

Fundort: Palabora mine, Limpopo Province, Süd-Afrika
Copyright: Stephan Wolfsried
Contribution: JHM 2006-01-06
Locality: Palabora Mine / Loolekop / Phalaborwa / Mopani, Distrikt / Limpopo, Provinz / Südafrika
Iowait
Views (File:
1217485108
): 1644
Iowait
Bildbreite: 15 mm; Fundort: Palabora, Loolekop, Südafrika
Copyright: Leonardus; Contribution: slugslayer
Location: Südafrika/Limpopo, Provinz/Mopani, Distrikt/Phalaborwa/Loolekop/Palabora Mine
Mineral: Iowaite
Image: 1217485108
License: Usage for Mineralienatlas project only
Iowait

Bildbreite: 15 mm; Fundort: Palabora, Loolekop, Südafrika
Copyright: Leonardus
Contribution: slugslayer 2008-07-31
Locality: Palabora Mine / Loolekop / Phalaborwa / Mopani, Distrikt / Limpopo, Provinz / Südafrika

Collectors Summary

Hardness (Mohs) 2.5
Solubility +++ Säuren
Crystal System trigonal, R3m

Chemism

Chemical formula

Mg6Fe3+2(OH)16Cl2·4H2O

Chemical composition

Chlor, Eisen, Magnesium, Sauerstoff, Wasserstoff

Unit weight: 672.606488 u; Number of atoms in the formula: 54

Info

Empirical formula:

Mg6Fe2(OH)16Cl2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.60

24

44.44

1.0079470

24.1907280
Oxygen

O

47.57

20

37.04

15.9994300

319.9886000
Magnesium

Mg

21.68

6

11.11

24.3050600

145.8303600
Chlorine

Cl

10.54

2

3.70

35.4532000

70.9064000
Iron

Fe

16.61

2

3.70

55.8452000

111.6904000

Analysis wt%

MgO : 35.69, FeO : 1.08, Fe2O3 : 23.97, Cl : 7.45, CO2 : 0.40, H2O : 33.10 (Ref: Mineralogical Magazine 94)

Strunz 9th edition incl. updates

4.FL.05

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

Lapis Classification

IV/F.05-020

IV: OXIDE
F: Hydroxide und oxidische Hydrate (wasserhaltige Oxide mit Schichtstruktur)

Classification by Hölzel

5.DD.530

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
D: Carbonates (+Anions +Water)
D: Hydrotalcite Series
5: Pyroaurite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Hydrotalcite Supergroup  ⇒ Hydrotalcite Group

Optical Properties

max. Birefringence

0.010
Birefringence chart\! Iowaite title=Birefringence chart Iowaite

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

1.543

RI value γ / ε

1.533

Ri mean

1.540

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

3.118

Cell parameters b (Å)

-

Cell parameters c (Å)

24.113

Cell parameters a/b or c/a

7.733

Cell parameters c/b

-

Z

0.375

Volumne (ų)

203.018

X-Ray Powder Diffraction

7.90(100),
3.943(40),
2.625(40),
2.341(40),
1.987(40),
1.566(10),
1.524(10),
1.291(10)
XRD chart Iowaite

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)

2.5

Density (g/cm³)

2.09 (gemessen)

2.063 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/Iowa/Sioux Co.

Preface

Author (Name, Year)

Kohls & Rodda, 1967

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 269

IMA group assignments

Other languages

German

Iowait

French

Iowaite

English

Iowaite

Spanish

Iowaíta

Russian

Айоваит

CNMNC (IMA)-Number

IMA 1967-002

CNMNC symbol

Symbol

Iow

Locations with GPS information