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Chlormagaluminite (Chlormagaluminit)

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 1.5 - 2.5
Cleavages gut
Solubility +++ Säuren
Crystal System hexagonal, P6c2

Chemism

Chemical formula

(Mg,Fe2+)4Al2(OH)12(Cl2,CO3)·2H2O

Chemical composition

Aluminium, Chlor, Eisen, Magnesium, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 491.0246959 u; Number of atoms in the formula: 38.5

Info

Empirical formula:

(Mg0.75Fe0.25)4Al2(OH)12((Cl2)0.75(CO3)0.25)·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.28

16

41.56

1.0079470

16.1271520

Carbon

C

0.61

0.25

0.65

12.0107800

3.0026950

Oxygen

O

48.06

14.75

38.31

15.9994300

235.9915925

Magnesium

Mg

14.85

3

7.79

24.3050600

72.9151800

Aluminium

Al

10.99

2

5.19

26.9815382

53.9630764

Chlorine

Cl

10.83

1.5

3.90

35.4532000

53.1798000

Iron

Fe

11.37

1

2.60

55.8452000

55.8452000

Analysis wt%

MgO : 30.84, FeO : 4.10, Fe2O3 : 1.15, Al2O3 : 21.20, H2O : 32.39, Cl : 11.31, CO2 : 1.10 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 82)

Strunz 9th edition incl. updates

5.DA.45

5: Carbonate (Carbonate, Nitrate)
D: Carbonate mit weitere Anionen, mit H2O
A: Mit mittelgroßen [Kationen]
45:Manasseit-Gruppe

Lapis Classification

IV/F.05-005

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

Classification by Hölzel

5.DD.120

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Hydrotalcite Supergroup  ⇒ Quintinite Group

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.020

Birefringence chart\! Chlormagaluminite title=Birefringence chart Chlormagaluminite

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

1.540

RI value γ / ε

1.560

Ri mean

1.547

2V angle

Uniaxial (+)

Crystallography

Crystal System

hexagonal

Class (H-M)

6m2

Space Group number

188

Space Group

P6c2

Cell parameters a (Å)

5.29

Cell parameters b (Å)

-

Cell parameters c (Å)

15.46

Cell parameters a/b or c/a

2.922

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

374.672

X-Ray Powder Diffraction

7.67(100),
3.86(80),
2.60(80),
2.34(90),
2.17(90),
1.839(100),
1.526(90),
1.496(90)

XRD chart Chlormagaluminite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

1.5 - 2.5

Density (g/cm³)

2.03 (gemessen)

2.176 ( ρ calc. Mineralienatlas )

Cleavages

gut

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Angara, Fluss/Kapaevskaya Schlot

Type material

Mineralogisches Museum der Universität Marburg

Preface

Author (Name, Year)

Kashaev & Feoktisov & Petrova, 1982

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 111 (1982), 121

IMA group assignments



 
 
 
Fe42+Al2[(OH)12|CO3]·3H2O
trigonal
P3112, P3222

 
 
 
Mn42+Al2[(OH)12|CO3]·3H2O
hexagonal
P6322

 
 
 
Mn42+Al2[(OH)12|CO3]·3H2O
trigonal
P3112, P3222

 
 
 
(Mg,Fe2+)4Al2(OH)12(Cl2,CO3)·2H2O
hexagonal
P6c2

 
 
 
Ni4Co3+2(CO3)(OH)12·3H2O
hexagonal
 

 
 
 
Mg4Al2[(OH)12|CO3]·3H2O
hexagonal
P6322

 
 
 
Mg4Al2[(OH)12|CO3]·3H2O
trigonal
P3112, P3222

 
 
 
Zn4Al2(OH)12(CO3)·3H2O
hexagonal
P63/mmc

 
 
 
(Zn0.6Al0.4)(OH)2(CO3)0.2·0.5H2O
trigonal
 

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Actuality: 28. Mar 2024 - 18:32:49

Other languages

German

Chlormagaluminit

French

Chlormagaluminite

English

Chlormagaluminite

Spanish

Clormagaluminita

Russian

Хлормагалюминит

Alternative Name

Chlormagaluminita

English

Chlormanasseite

CNMNC (IMA)-Number

IMA 1980-098

CNMNC symbol

Symbol

Cma

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 9zuY-Fhz10yN_5rZ18rZGQ
GUID (Global unique identifier) F8983BF7-7358-4CD7-8DFF-9AD9D7CAD919
Database ID 728