Tokyoite Mineral Data

Tokyoite Mineral Data

General Tokyoite Information

Chemical Formula:

Ba2Mn(VO4)2(OH)

Composition:

Molecular Weight = 576.48 gm

Barium 47.64 % Ba 53.19 % BaO

Manganese 9.53 % Mn 13.69 % Mn₂O₃

Vanadium 17.67 % V 31.55 % V₂O₅

Hydrogen 0.17 % H 1.56 % H₂O

Oxygen 24.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₂Mn³⁺(VO₄)₂(OH)

Environment:

Mn-dominant analogue of gamagarite

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

Shiromaru Mine, Okutama, Tama district, Tokyo Prefecture, Kanto Region, Honshu Island, Japan. Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

Synonym:

IMA2003-036

Tokyoite Image

Images:

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

Axial Ratios:

a:b:c =1.4845:1:1.2871

Cell Dimensions:

a = 9.1, b = 6.13, c = 7.89, beta = 112.2° V = 407.50

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.31(1), 2.8(0.62), 2.71(0.4),3.46(0.26), 2.9(0.19), 2.16(0.18), 3(0.16),

Physical Properties of Tokyoite

Color:

Reddish black.

Diaphaniety:

Translucent

Luster:

Vitreous (Glassy)

Calculated Properties of Tokyoite

Fermion Index

Fermion Index = 0.08547
Boson Index = 0.91453

Photoelectric:

PE_Tokyoite= 221.32 barns/electron
U=PE_Tokyoite x r_electron= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tokyoite is Not Radioactive

Tokyoite Classification

Dana Class:

41.10.4.4 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.4)Dana Group

41.10.4.1 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.2 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.3 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

41.10.4.4 Tokyoite ! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Strunz Class:

VII/B.24-22 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

Other Tokyoite Information

See Also:

Links to other databases for Tokyoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Tokyoite

Ba2Mn(VO4)2(OH)
Dana No: 41.10.4.4 Strunz No: VII/B.24-22
Locality:

Notes: