Mineralogy Database

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