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Chloromagnesite (Chloromagnesit)

Collectors Summary

Color weiß
Streak color weiß
Solubility +++ H2O
Crystal System trigonal, R3m

Chemism

Chemical formula

MgCl2

Chemical composition

Chlor, Magnesium

Unit weight: 95.21146 u; Number of atoms in the formula: 3

Info

Empirical formula:

MgCl2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Magnesium

Mg

25.53

1

33.33

24.3050600

24.3050600
Chlorine

Cl

74.47

2

66.67

35.4532000

70.9064000

Strunz 9th edition incl. updates

3.AB.20

3: Halide (Fluoride, Chloride, Bromide, Iodide)
A: Einfache Halogenide ohne H2O
B: M:X = 1:2
20:Chloromagnesit-Gruppe

Lapis Classification

III/A.07-005

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
A: Einfache Halogenide
7: Wasserfrei, Metall : Halogen = 1:2, 1:3

Classification by Hölzel

3.AB.200

3: HALIDES
A: Simple Halides without H2O
B: Me/X=1/2
2: Chloromagnesite-Group

IMA status

Status fragwürdig

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.015~
Birefringence chart\! Chloromagnesite title=Birefringence chart Chloromagnesite

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

1.675

RI value γ / ε

1.59

Ri mean

1.647

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

3.58

Cell parameters b (Å)

-

Cell parameters c (Å)

17.59

Cell parameters a/b or c/a

4.913

Cell parameters c/b

-

Z

3

Volumne (ų)

195.237

X-Ray Powder Diffraction

5.93(20),
3.097(10),
2.966(50),
2.569(100),
1.816(40),
1.549(10),
1.483(10),
1.148(10)
XRD chart Chloromagnesite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.33s

2.429 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Vesuv

Preface

Author (Name, Year)

Scacchi, 1873

References

Dana's System of Mineralogy, 7th edition, 2 (1951), 41

Other languages

German

Chloromagnesit

French

Chloromagnesite

English

Chloromagnesite

Spanish

Cloromagnesita

Russian

Хлоромагнезит

Alternative Name

Spanish

Chloromagnesita

German

Cloromagnesit

Cloromagnesite

Italian

Cloruro di Magnesio

Italian

Magnesia muriata

CNMNC symbol

Symbol

Cmgs

Locations with GPS information