Iwakiite Mineral Data

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

Advertisment
The Mineral News newsletter has expanded to sixteen (16) pages a month and it has added significant features such as frequent book reviews, photographs to supplement new mineral descriptions. Occasional color issues are produced as well.
 Your premier supplier of quality mineral specimens from Southern Africa and the world at large
 Our Mission is Simple: RMS will be the go-to portal for all mineral, gem and rock shows in the USA
 McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

General Iwakiite Information

Help on Chemical Formula: Chemical Formula: Mn++(Fe+++,Mn+++)2O4
Help on Composition: Composition: Molecular Weight = 229.99 gm
   Manganese  40.61 %  Mn   30.84 % MnO / 24.03 % Mn2O3
   Iron       31.57 %  Fe   40.61 % FeO
   Oxygen     27.83 %  O
             ______        ______ 
             100.00 %       95.48 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Fe2+1.3Mn3+0.7O4
Help on Environment: Environment: Regionally metamorphosed bedded manganese deposit.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Gozaisho mine, Iwaki, Fukushima Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Iwakiite Say IWAKIITE
Help on Synonym: Synonym: ICSD 76612
  PDF 38-430
  alpha vrendenbergite
  vrendenbergite alpha
 

Iwakiite Image

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

Iwakiite

Comments: Back fine-grained granular iwakiite in pink rhodonite.
Location: Gazaisho Mine, Iwaki, Fukushima, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Iwakiite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.00246
Help on Cell Dimensions: Cell Dimensions: a = 8.519, c = 8.54, Z = 8; V = 619.78 Den(Calc)= 4.93
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 41/nnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.57(1), 1.506(0.4), 3.016(0.4),
Click Here for Large Iwakiite 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


Jarosch D , Zeitschrift fur Kristallographie , 185 (1988) p.605-605, Crystal structure of iwakiite, Locality: Gozaisho mine, Fukushima Prefecture, Japan, Note: coordinates from ICSD, reproduce reported bond lengths

 

Physical Properties of Iwakiite

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish black.
Help on Density: Density: 4.85
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Strongly magnetic
Help on Streak: Streak: black
 

Optical Properties of Iwakiite

Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.03 - from Gladstone-Dale relationship (KC = 0.2094) where Ncalc=Dcalc*KC+1
NCalc= 2.02 - from Gladstone-Dale relationship (KC = 0.2094) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate, yellowish to brownish gray.
Help on RL Color: RL Color: Light olive gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Iwakiite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 420 nm   20.00   19.40 
   
 440 nm   19.90   19.30 
 460 nm   20.30   19.50 
 480 nm   20.40   19.60 
 500 nm   20.80   19.80 
 520 nm   21.20   20.10 
 540 nm   21.40   20.30 
 560 nm   21.30   20.40 
 580 nm   21.20   20.10 
 600 nm   21.00   20.00 
 620 nm   20.90   19.70 
 640 nm   20.50   19.60 
 660 nm   20.40   19.20 
 680 nm   20.20   19.10 
Calculated Relative Intensity Colors of Iwakiite in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 450%
R1                    
R2                    
 

Calculated Properties of Iwakiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.64 gm/cc
note: Specific Gravity of Iwakiite =4.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.006825684
Boson Index = 0.993174316
Help on Photoelectric: Photoelectric: PEIwakiite = 20.39 barns/electron
U=PEIwakiite x rElectron Density= 94.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Iwakiite is Not Radioactive
 

Iwakiite Classification
Help on Dana Class: Dana Class: 07.02.06.02 (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.06)Dana Group
 
07.02.06.01 Kusachiite CuBi2O4 P 4/ncc 4/m 2/m 2/m
 
07.02.06.02 Iwakiite Mn(Fe,Mn)2O4 P 41/nnm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: 04.BB.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BB -With only medium-sized cations
 
04.BB.10 Hausmannite MnMn2O4 I 41/amd 4/m 2/m 2/m
 
04.BB.10 Iwakiite Mn(Fe,Mn)2O4 P 41/nnm 4/m 2/m 2/m
 
04.BB.10 Hydrohetaerolite Zn2Mn4O8•(H2O) I 41/amd 4/m 2/m 2/m
 
04.BB.10 Hetaerolite ZnMn2O4 I 41/amd 4/m 2/m 2/m
 

Other Iwakiite Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Iwakiite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

Search for Iwakiite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Iwakiite :

Cape Minerals Google Search for Iwakiite
Dakota Matrix Minerals Google Search for Iwakiite
Excalibur Mineral Corp. Google Search for Iwakiite
Exceptional Minerals Google Search for Iwakiite
John Betts Fine Minerals Search for Iwakiite
McDougall Minerals Google Search for Iwakiite
Mineral News Website Link
Rock and Mineral Shows Google Search for Iwakiite
Weinrich Minerals, Inc. Google Search for Iwakiite

Ask about Iwakiite 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 Iwakiite Specimen Label here :

Iwakiite

Mn++(Fe+++,Mn+++)2O4
Dana No: 07.02.06.02 Strunz No: 04.BB.10
Locality:

 

Notes: