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Tokyoite Mineral Data

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General Tokyoite Information

Help on Chemical  Formula: Chemical Formula: Ba2Mn(VO4)2(OH)
Help on Composition: Composition: Molecular Weight = 565.05 gm
   Barium     46.66 %  Ba   52.10 % BaO
   Sodium      0.08 %  Na    0.11 % Na2O
   Strontium   0.16 %  Sr    0.18 % SrO
   Calcium     0.07 %  Ca    0.10 % CaO
   Manganese   7.88 %  Mn   11.32 % Mn2O3
   Aluminum    0.05 %  Al    0.09 % Al2O3
   Vanadium   17.94 %  V    32.03 % V2O5
   Iron        1.68 %  Fe    2.40 % Fe2O3
   Silicon     0.05 %  Si    0.11 % SiO2
   Hydrogen    0.18 %  H     1.59 % H2O
   Oxygen     25.26 %  O
             ______        ______ 
             100.00 %      100.03 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba1.92Na0.02Sr0.01Ca0.01Mn3+0.81Fe3+0.17Al0.01V5+1.99Si0.01O7.92(OH)
Help on Environment: Environment: Found in an outcrop of an abandoned Mn ore deposit in the Shiromaru mine. The ore deposit occurs in chert blocks enclosed in middle to upper Jurassic sandstones. Mn-dominant analogu e of gamagarite
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Shiromaru Mine, Okutama, Tama district, Tokyo Prefecture, Kanto Region, Honshu Island, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2003-036
 

Tokyoite Image

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  Tokyoite

Comments: Metallic reddish brown crystals of tokyoite (< 0.3 mm) on dark gray braunite matrix.
Location: Gambatesa mine, Graveglia Valley, Genova, Italy. Scale: Picture size 4 mm.
© Tom Loomis / Dakota Matrix

Tokyoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4845:1:1.2871
Help on Cell Dimensions: Cell Dimensions: a = 9.1, b = 6.13, c = 7.89, Z = 2; beta = 112.2° V = 407.50 Den(Calc)= 4.60
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.31(1)(112 ), 2.8(0.62)(121,300 ), 2.71(0.4)(311 ), 3.46(0.26)(210 )3.08(0.2)(020 ), 2.9(0.19)(120 ), 2.16(0.18)(321 )1.963(0.15)(204 3.73(0.15)(111 ),
 

Physical Properties of Tokyoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Reddish black.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Unknown - Minerals too small to observe fractures.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: dark brownish-red
 

Optical Properties of Tokyoite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2196,KC= 0.2237
Ncalc = 2.03
Help on Optical Data: Optical Data: Biaxial (?), a=1.99, g=2.03, bire=0.0400
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tokyoite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   12.80   13.20 
   
 546 nm   12.30   12.60 
 589 nm   12.20   12.50 
 650 nm   12.50   12.60 
Standardized Intensity (100%) Reflection Spectra of Tokyoite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm    3.30    3.50 
   
 546 nm    3.10    3.40 
 589 nm    3.10    3.60 
 650 nm    3.60    4.30 
Calculated Relative Intensity Colors of Tokyoite in Air
Relative
Intensity
   0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 710%
R1                      
R2                      
Calculated Relative Intensity Colors of Tokyoite in Oil
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Tokyoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Tokyoite =4.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PETokyoite = 216.84 barns/electron
U=PETokyoite x rElectron Density= 887.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tokyoite is Not Radioactive
 

Tokyoite Classification

Help on  Dana Class: Dana Class: 41.10.04.04 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.10)where (A++ B++)3 (XO4)2 Zq
  (41.10.04)Goedkenite Group
 
41.10.04.01 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21/m 2/m
 
41.10.04.02 Bearthite Ca2Al(PO4)2(OH) P 21/m 2/m
 
41.10.04.03 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21/m 2/m
 
41.10.04.04 Tokyoite! Ba2Mn(VO4)2(OH) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
 
08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21/m 2/m
 
08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 21/m 2/m
 
08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 21/m 2/m
 
08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21,P 21/m Mono
 
08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21/m 2/m
 
08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 21/m 2/m
 
08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 21/m 2/m
 
08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 21/m 2/m
 
08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 21/m 2/m
 

Other Tokyoite Information

Help on References: References: NAME( AmMin, v90, p1468) PHYS. PROP.(AmMin, v90, p1468) OPTIC PROP.(AmMin, v90, p1468)
Help on See Also: See Also: Links to other databases for Tokyoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Tokyoite

Ba2Mn(VO4)2(OH)
Dana No: 41.10.04.04 Strunz No: 08.BG.05
Locality:

 

Notes:

 

 
   
 


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