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Douglasite (Douglasita)

Additional Functions

Collectors Summary

Color hellgrün
Solubility +++ H2O
Crystal System monoklin,

Chemism

Chemical formula

K2Fe2+Cl4·2H2O

Chemical composition

Chlor, Eisen, Kalium, Sauerstoff, Wasserstoff

Unit weight: 311.885268 u; Number of atoms in the formula: 13

Info

Empirical formula:

K2FeCl4·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.29

4

30.77

1.0079470

4.0317880

Oxygen

O

10.26

2

15.38

15.9994300

31.9988600

Chlorine

Cl

45.47

4

30.77

35.4532000

141.8128000

Potassium

K

25.07

2

15.38

39.0983100

78.1966200

Iron

Fe

17.91

1

7.69

55.8452000

55.8452000

Strunz 9th edition incl. updates

3.CJ.20

3: Halide (Fluoride, Chloride, Bromide, Iodide)
C: Komplexe Halogenide
J: Mit MX6 Komplexen; M = [Fe], [Mn], [Cu]
20:Mitscherlichit-Gruppe

Lapis Classification

III/C.07-020

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
C: Doppelhalogenide (meist mit OH,H2O)
7: Chloride

Classification by Hölzel

3.DB.120

3: HALIDES
D: Complex Halides
B: With H2O and without Al

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellgrün

max. Birefringence

0.012

Birefringence chart\! Douglasite title=Birefringence chart Douglasite

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

1.488

RI value β

1.488

RI value γ / ε

1.500

Ri mean

1.492

2V angle

Biaxial (+) 5°

Crystallography

Crystal System

monoklin

Cell parameters a (Å)

11.80

Cell parameters b (Å)

16.27

Cell parameters c (Å)

8.225

Cell parameters a/b or c/a

0.725

Cell parameters c/b

0.506

Cell parameters α

90°

Cell parameters β

104.88

Cell parameters γ

90°

Z

6

Volume (ų)

1526.131

X-Ray Powder Diffraction

5.065(50),
4.157(60),
4.032(60),
3.665(80),
3.081(100),
2.968(50),
2.842(40),
2.744(30)

XRD chart Douglasite

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

Physical Properties

Density (g/cm³)

2.16s

2.036 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

Preface

Occurrences

In Halit-Kalisalz Lagerstätten

Associations

Carnallit, Sylvit, Halit

Author (Name, Year)

Precht, 1880

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 167

Other languages

German

Douglasit

Spanish

Douglasita

French

Douglasite

English

Douglasite

Russian

Дугласит

Simplified Chinese

绿钾铁盐

Alternative Name

German

Eisenchlorürchlorkalium

CNMNC symbol

Symbol

Dgl

IDs

GUSID (Global unique identifier short form) 79BbBYGrNUGithQ45UwmkQ
GUID (Global unique identifier) 055BD0EF-AB81-4135-A2B6-1438E54C2691
Database ID 962