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Woodallite (Woodallit)

Collectors Summary

Color rotviolett, blasslila
Streak color weiß
Hardness (Mohs) 1.00 - 2.00
Crystal System trigonal, R3m

Chemism

Chemical formula

Mg6(Cr,Fe3+)2(OH)16Cl2·4H2O

Chemical composition

Chlor, Chrom, Eisen, Magnesium, Sauerstoff, Wasserstoff

Unit weight: 666.832928 u; Number of atoms in the formula: 54

Info

Empirical formula:

Mg6(Cr0.75Fe0.25)2(OH)16Cl2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.63

24

44.44

1.0079470

24.1907280

Oxygen

O

47.99

20

37.04

15.9994300

319.9886000

Magnesium

Mg

21.87

6

11.11

24.3050600

145.8303600

Chlorine

Cl

10.63

2

3.70

35.4532000

70.9064000

Chromium

Cr

11.70

1.5

2.78

51.9961600

77.9942400

Iron

Fe

4.19

0.5

0.93

55.8452000

27.9226000

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.05-015

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

Classification by Hölzel

5.DD.535

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

Color

rotviolett, blasslila

Streak color

weiß

max. Birefringence

0.020

Birefringence chart\! Woodallite title=Birefringence chart Woodallite

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

1.555

RI value γ / ε

1.535

Ri mean

1.548

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

3.103

Cell parameters b (Å)

-

Cell parameters c (Å)

24.111

Cell parameters a/b or c/a

7.770

Cell parameters c/b

-

Z

0.375

Volume (ų)

201.052

X-Ray Powder Diffraction

8.04(100),
4.020(50),
2.679(10),
2.624(10),
2.349(10),
2.007(10),
1.698(10),
1.524(10)

XRD chart Woodallite

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)

1.00 - 2.00

Density (g/cm³)

2.062 (gemessen)

2.065 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Grguric & Madsen & Pring, 2001

References

Mineralogical Magazine 65 (2001), 427

IMA group assignments

Other languages

German

Woodallit

Spanish

Woodallita

English

Woodallite

French

Woodallite

Russian

Вудаллит

Simplified Chinese

羟氯铬镁石

CNMNC (IMA)-Number

IMA 2000-042

CNMNC symbol

Symbol

Wod

Locations with GPS information

IDs

GUSID (Global unique identifier short form) BngcL2Ove0m6W0dzC5HltA
GUID (Global unique identifier) 2F1C7806-AF63-497B-BA5B-47730B91E5B4
Database ID 4193