Rokuhnite Mineral Data

Rokuhnite Mineral Data +

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General Rokuhnite Information

Chemical Formula:

Fe++Cl2·(H2O)

Composition:

Molecular Weight = 144.77 gm

Iron 38.58 % Fe 49.63 % FeO

Hydrogen 1.39 % H 12.44 % H₂O

Chlorine 48.98 % Cl 48.98 % Cl

- % Cl -11.05 % -O=Cl₂

Oxygen 11.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Cl₂·(H₂O)

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Synonym:

Rokuehnite

Rokuhnite Image

Images:

Rokuhnite Carnallite

Comments: Reddish brown rokuhnite, with carnallite (deliquescent).
Location: Salzdetfurth Mine, Hildesheim, near Hanover, Niedersachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rokuhnite Crystallography

Axial Ratios:

a:b:c =0.8744:1:0.4301

Cell Dimensions:

a = 7.396, b = 8.458, c = 3.638, Z = 2; beta = 97.68° V = 225.54 Den(Calc)= 2.13

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.53(1), 2.762(0.7), 4.228(0.6),

Physical Properties of Rokuhnite

Color:

Colorless.

Density:

2.35

Diaphaniety:

Transparent

Optical Properties of Rokuhnite

Gladstone-Dale:

CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3036,KPDmeas= 0.2752,KC= 0.2904

Optical Data:

Biaxial (+), a=1.605, b=1.633, g=1.702, bire=0.0970, 2V(Calc)=68, 2V(Meas)=64.

Calculated Properties of Rokuhnite

Electron Density:

r_electron=2.06 gm/cc
note: r_Rokuhnite=2.13 gm/cc.

Fermion Index

Fermion Index = 0.00823
Boson Index = 0.99177

Photoelectric:

PE_Rokuhnite= 14.84 barns/electron
U=PE_Rokuhnite x r_electron= 30.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rokuhnite is Not Radioactive

Rokuhnite Classification

Dana Class:

9.2.4.1 (9)Anhydrous and Hydrated Halides

(9.2)where A (X)2

(9.2.4)Dana Group

9.2.4.1 Rokuhnite FeCl2·(H2O) C 2/m 2/m

Strunz Class:

III/A.12-50 III - Halogenides

III/A - Simple Halogenides, with water Metal : Halogen = 1 : 1 to 1 : 3

III/A.12 - Hydrohalite - Antarcticite series

III/A.12-10 Hydrohalite NaCl·2(H2O) P 2₁/c 2/m

III/A.12-20 Eriochalcite CuCl2·2(H2O) Pbmn 2/m 2/m 2/m

III/A.12-30 Bischofite MgCl2·6(H2O) C 2/m 2/m

III/A.12-40 Nickelbischofite NiCl2·6(H2O) C 2/m 2/m

III/A.12-50 Rokuhnite FeCl2·(H2O) C 2/m 2/m

III/A.12-70 Sinjarite CaCl2·2(H2O) Unk. Tetra

III/A.12-80 Antarcticite CaCl2·6(H2O) P 3₂1 3 2

Other Rokuhnite Information

References:

NAME( Athena) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rokuhnite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Translate Rokuhnite Mineral Data :

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Print or Cut-and-Paste your Rokuhnite Specimen Label here :

Rokuhnite

Fe++Cl2·(H2O)
Dana No: 9.2.4.1 Strunz No: III/A.12-50
Locality:

Notes: