Mineralogy Database

Rokuhnite Mineral Data

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General Rokuhnite Information

Help on Chemical  Formula: Chemical Formula: Fe++Cl2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+Cl2•(H2O)
Help on Environment: Environment: Secondary mineral in fissures in earlier potassium-rich salt beds.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Salzdetfurth potash mine, Hamelyn, Lower Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert K´┐Żuhn (1911- ), German mineralogist, Kaliforschungs-Institut der Kali und Salz AG, Hannover, Germany.
Help on Name Pronunciation: Name Pronunciation: Rokuhnite + Pronunciation Say ROKUHNITE
Help on Synonym: Synonym: Rokuehnite

Rokuhnite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8744:1:0.4301
Help on Cell Dimensions: Cell Dimensions: a = 7.396, b = 8.458, c = 3.638, Z = 2; beta = 97.68° V = 225.54 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.53(1), 2.762(0.7), 4.228(0.6),

Physical Properties of Rokuhnite

Help on Color: Color: Colorless.
Help on Density: Density: 2.35
Help on Diaphaneity: Diaphaneity: Transparent

Optical Properties of Rokuhnite

Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.06 gm/cc
note: Specific Gravity of Rokuhnite =2.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0082334572
Boson Index = 0.9917665428
Help on Photoelectric: Photoelectric: PERokuhnite = 14.84 barns/electron
U=PERokuhnite x rElectron Density= 30.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rokuhnite is Not Radioactive

Rokuhnite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.04)Dana Group Rokuhnite FeCl2•(H2O) C 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.BB.10 03 - HALIDES
  03.B - Simple Halides, with H2O
  03.BB -M:X = 1:2
03.BB.10 Rokuhnite FeCl2•(H2O) C 2/m 2/m

Other Rokuhnite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Rokuhnite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 03.BB.10





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