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Douglasite (Douglasit)

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

Volumne (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

(Co-)Type locality

(Co-)Type locality

Deutschland/Sachsen-Anhalt/Salzlandkreis/Börde-Hakel/Westeregeln/Kaliwerk Douglashall

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