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Rokühnite

Collectors Summary

Color farblos
Streak color weiß
Solubility +++ H2O, hygroskopisch, hydratisiert zu FeCl2*4H2O an feuchterLuft und oxidiert
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

Fe2+Cl2·H2O

Chem­ical com­po­si­tion

Chlor, Eisen, Sauerstoff, Wasserstoff

Unit weight: 144.766924 u; Number of atoms in the formula: 6

Info

Empirical formula:

FeCl2·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.39

2

33.33

1.0079470

2.0158940

Oxygen

O

11.05

1

16.67

15.9994300

15.9994300

Chlorine

Cl

48.98

2

33.33

35.4532000

70.9064000

Iron

Fe

38.58

1

16.67

55.8452000

55.8452000

Strunz 9th edi­tion incl. updates

3.BB.10

3: Halide (Fluoride, Chloride, Bromide, Iodide)
B: Einfache Halogenide mit H2O
B: M:X = 1:2
10:Rokühnit-Gruppe

Lapis Clas­sifica­tion

III/A.12-050

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
A: Einfache Halogenide
12: Wasserhaltig, Metall : Halogen = 1:1 bis 1:3

Clas­sifica­tion by Hölzel

3.BB.150

3: HALIDES
B: Simple Halides with H2O
B: Me/X=1/2

Dana 8th edi­tion

09.02.04.01

09: Halide Minerals
02: Anhydrous and Hydrated Halides where A (X)2

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.098

Birefringence chart\! Rokühnite title=Birefringence chart Rokühnite

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

1.605

RI value β

1.633

RI value γ / ε

1.703

Ri mean

1.647

2V angle

Biaxial (+) 64°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

7.396

Cell param­e­ters b (Å)

8.458

Cell param­e­ters c (Å)

3.638

Cell param­e­ters a/b or c/a

0.874

Cell param­e­ters c/b

0.430

Cell param­e­ters α

90°

Cell param­e­ters β

97.68

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

225.535

X-Ray Pow­der Diffrac­tion

5.536(100),
4.228(60),
2.892(50),
2.762(70),
2.744(30),
2.415(50),
2.116(30),
2.096(30)

XRD chart Rokühnite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.35 (gemessen)

2.132 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O, hygroskopisch, hydratisiert zu FeCl2*4H2O an feuchterLuft und oxidiert

Preface

Author (Name, Year)

von Hodenberg & von Struensee, 1980

References

Neues Jahrbuch für Mineralogie, Monatshefte (1980), 125

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Rokühnite

Fe2+Cl2·H2O

monoklin : 2/m : C2/m

3.BB.10

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Hydrohalite

NaCl·2H2O

monoklin : 2/m : P21/c

III/A.12-010

Eriochalcite

CuCl2·2H2O

orthorhombisch : mmm : Pbmn

III/A.12-020

Bischofite

MgCl2·6 H2O

monoklin : 2/m : C2/m

III/A.12-030

Nickelbischofite

NiCl2·6H2O

monoklin : 2/m : C2/m

III/A.12-040

Rokühnite

Fe2+Cl2·H2O

monoklin : 2/m : C2/m

III/A.12-050

Sinjarite

CaCl2·2H2O

III/A.12-070

Ghiaraite

CaCl2·4H2O

triklin : 1 : P1

III/A.12-075

Antarcticite

CaCl2·6H2O

trigonal : 32 : P321

III/A.12-080

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Eriochalcite

CuCl2·2H2O

orthorhombisch : mmm : Pbmn

3.BB.100

Rokühnite

Fe2+Cl2·H2O

monoklin : 2/m : C2/m

3.BB.150

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Fluorite

CaF2

kubisch : m3m : Fm3m

09.02.01.01

Frankdicksonite

BaF2

kubisch : m3m : Fm3m

09.02.01.02

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

09.02.01.03

Sellaite

MgF2

tetragonal : 4/mmm : P42/mnm

09.02.02.01

Lawrencite

(Fe2+,Ni)Cl2

trigonal : 3m : R3m

09.02.03.01

Scacchite

MnCl2

trigonal : 3m : R3m

09.02.03.02

Rokühnite

Fe2+Cl2·H2O

monoklin : 2/m : C2/m

09.02.04.01

Sinjarite

CaCl2·2H2O

09.02.05.01

Antarcticite

CaCl2·6H2O

trigonal : 32 : P321

09.02.06.01

Cotunnite

PbCl2

orthorhombisch : mmm : Pnam

09.02.07.01

'Hydrophilite'

CaCl2 (?)

orthorhombisch : mmm : Pnnm

09.02.07.02

Eriochalcite

CuCl2·2H2O

orthorhombisch : mmm : Pbmn

09.02.08.01

Tolbachite

CuCl2

monoklin : 2/m : C2/m

09.02.08.02

Bischofite

MgCl2·6 H2O

monoklin : 2/m : C2/m

09.02.09.01

Nickelbischofite

NiCl2·6H2O

monoklin : 2/m : C2/m

09.02.09.02

CNMNC symbol

Symbol

Rok

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Rokühnit
Google-Bilder-Suche - search for: Rokühnit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Rokühnit

English pages

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American-Mineralogist-Crystal-Structure-Database - search for: Rokühnite
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Russian pages

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