Rokuhnite Mineral Data

Rokuhnite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About


Dan Weinrich Fine Minerals
[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows


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 KĻuhn (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

Click Here for Larger Rokuhnite Image in a New Browser Window Images:
Click Here for Larger Rokuhnite Image

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 - PrismaticH-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),
Click Here for Large Rokuhnite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Morosin B , Graeber E J , Journal of Chemical Physics , 42 (1965) p.898-901, Crystal structures of manganese(II) and iron(II) chloride dihydrate, Locality: synthetic

 

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: 09.02.04.01 (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.04)Dana Group
 
09.02.04.01 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Rokuhnite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Rokuhnite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Rokuhnite Mineral Data :

Ask about Rokuhnite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Rokuhnite

Fe++Cl2•(H2O)
Dana No: 09.02.04.01 Strunz No: 03.BB.10
Locality:

 

Notes: