Todorokite Mineral Data

Todorokite Mineral Data
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General Todorokite Information

Help on Chemical Formula: Chemical Formula: (Na,Ca,K)2(Mn++++,Mn+++)6O12•3-4.5(H2O)
Help on Composition: Composition: Molecular Weight = 583.05 gm
   Potassium   0.13 %  K     0.16 % K2O
   Sodium      0.79 %  Na    1.06 % Na2O
   Calcium     0.34 %  Ca    0.48 % CaO
   Manganese  56.54 %  Mn   27.08 % Mn2O3 / 59.64 % MnO2
   Hydrogen    1.04 %  H     9.27 % H2O
   Oxygen     41.16 %  O
             ______        ______ 
             100.00 %       97.69 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.2Ca0.05K0.02Mn4+4Mn3+2O12•3(H2O)
Help on Environment: Environment: Primarily found as a constituent mineral in deep sea nodules.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1934
Help on Locality: Locality: Todroki mine, Hikkaido, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Todorokite + Pronunciation Say TODOROKITE
Help on Synonym: Synonym: ICSD 202725
  PDF 38-475
 

Todorokite Image

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

Todorokite   Opal

Comments: Dendritic todorokite in white opal.
Location: Brosso Mine, Ivrea, Torino, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Todorokite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =3.4356:1:3.3606
Help on Cell Dimensions: Cell Dimensions: a = 9.764, b = 2.842, c = 9.551, Z = 1; beta = 94.14° V = 264.34 Den(Calc)= 3.66
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.68(1), 4.8(0.8), 2.39(0.4),
Click Here for Large Todorokite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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B - Bonds On/Off
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Post J E , Bish D L , American Mineralogist , 73 (1988) p.861-869, Rietveld refinement of the todorokite structure, Sample: South Africa Ka

View Additional jPOWD Structure files for Todorokite
[1] [2] [3]
 

Physical Properties of Todorokite

Help on Cleavage: Cleavage: {100} Perfect, {010} Perfect
Help on Color: Color: Brownish black, Gray, Grayish black, Dark brown, Black.
Help on Density: Density: 3.49 - 3.82, Average = 3.65
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum
Help on Luster: Luster: Metallic - Dull
Help on Streak: Streak: dark brown
 

Optical Properties of Todorokite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.3514) where Ncalc=Dcalc*KC+1
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.3514) where Ncalc=Dmeas*KC+1
Help on Pleochroism (x): Pleochroism (x): dark brown.
Help on Pleochroism (y): Pleochroism (y): brownish.
Help on Pleochroism (z): Pleochroism (z): yellowish brown.
Help on RL Anisotrophism: RL Anisotrophism: Very strong, bluish or brownish.
Help on RL Color: RL Color: Gray white.
Help on RL Pleochroism: RL Pleochroism: Strong to faint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Todorokite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   13.90   24.70 
   
 420 nm   13.20   24.20 
 440 nm   12.50   23.70 
 460 nm   11.70   22.00 
 480 nm   11.10   20.60 
 500 nm   10.60   19.40 
 520 nm   10.20   18.60 
 540 nm   10.00   17.90 
 560 nm    9.70   17.30 
 580 nm    9.50   16.80 
 600 nm    9.30   16.40 
 620 nm    9.10   16.10 
 640 nm    9.00   15.80 
 660 nm    9.00   15.50 
 680 nm    8.90   15.30 
 700 nm    8.90   15.10 
Calculated Relative Intensity Colors of Todorokite in Air
Relative
Intensity		    0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 910%
R1                      
R2                      
 

Calculated Properties of Todorokite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.51 gm/cc
note: Specific Gravity of Todorokite =3.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002039307
Boson Index = 0.9997960693
Help on Photoelectric: Photoelectric: PETodorokite = 14.72 barns/electron
U=PETodorokite x relectron= 51.66 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1.87 (Gamma Ray American Petroleum Institute Units)
Concentration of Todorokite per GRapi unit = 53.41 (%)

Estimated Radioactivity from Todorokite - barely detectable

 

Todorokite Classification
Help on Dana Class: Dana Class: 07.08.01.01 (07)Multiple Oxides
  (07.08)where A B (O)2·x(H2O)
  (07.08.01)Dana Group
 
07.08.01.01 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m
 
07.08.01.02 Woodruffite (Zn,Mn)2Mn5O12•4(H2O) Unk Tetra
Help on Strunz Class: Strunz Class: 04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DK -With large (± medium-sized) cations; tunnel structures
 
04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
 
04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m
 
04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m
 
04.DK.10 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m
 

Other Todorokite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Todorokite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Todorokite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Todorokite

(Na,Ca,K)2(Mn++++,Mn+++)6O12•3-4.5(H2O)
Dana No: 07.08.01.01 Strunz No: 04.DK.10
Locality:

 

Notes: