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Tokyoite

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Big Photo

Valgraveglia Mine (Gambatesa Mine), Reppia, Graveglia Valley, Ne, Genova Province, Liguria, Italy
© Stephan Wolfsried

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Formula:
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
System:MonoclinicColour:Red black
Hardness:4½ - 5
Member of:Brackebuschite Group
Name:
Named after the prefecture of occurrence.
This page provides mineralogical data about Tokyoite.

Classification of Tokyoite

IMA status:Approved 2003
Strunz 8th edition ID:7/B.24-22
Nickel-Strunz 10th (pending) edition ID:8.BG.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
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Type Occurrence of Tokyoite

Type Locality:Shiromaru mine (Hakumaru mine), Okutama-cho, Nishi-Tama-gun, Tokyo Prefecture, Kanto Region, Honshu Island, Japan
General Appearance of Type Material:Reddish brown micrograins and microcrystals
Geological Setting of type material:Metamorphosed low-grade sedimentary manganese ore

Occurrences of Tokyoite

Geological Setting:Metamorphosed Mn ores.

Physical Properties of Tokyoite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Red black
Streak:Deep brownish red
Hardness (Mohs):4½ - 5
Hardness (Vickers):VHN25=363 - 390 kg/mm2
Cleavage:None Observed
Density (calculated):4.62 g/cm3

Crystallography of Tokyoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 9.104Å, b = 6.132Å, c = 7.895Å
β = 112.2°
Ratio:a:b:c = 1.485 : 1 : 1.288
Unit Cell Volume:V 408 ų
Morphology:Small aggregates of irregular grains.
X-Ray Powder Diffraction:
d-spacingIntensity
3.31 (100)
2.80 (60)
2.71 (40)

Chemical Properties of Tokyoite

Formula:
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Idealised Formula:
Ba
 
2
Mn
3+
 
[OH|(VO
 
4
)
 
2
]
Essential elements:Ba, H, Mn, O, V
All elements listed in formula:Ba, Fe, H, Mn, O, V

Relationship of Tokyoite to other Species

Member of:Brackebuschite Group
Other Members of Group:

- +
Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)
Goedkenite
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
Cu(PO
 
4
)(MoO
 
4
,AsO
 
4
,CrO
 
4
,GaO
 
4
)(OH)
8.BG.05Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
8.BG.05Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
(PO
 
4
)
 
2
(OH)
8.BG.15Tancoite
LiNa
 
2
Al(PO
 
4
)(HPO
 
4
)(OH)

Other Names for Tokyoite

Synonyms:
IMA2003-036
Other Languages:
German:Tokyoit
Japanese:東京石

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tokyoite

Reference List:

- +
Matsubara, S., Miyawaki, R., Yokoyama, K., Shimizu, M., Imai, H. (2004): Tokyoite, Ba2Mn3+(VO4)2(OH), a new mineral from the Shiromaru mine, Okutama, Tokyo, Japan. Journal of Mineralogical and Petrological Sciences 99, 363-367.

Internet Links for Tokyoite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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    • Localities for Tokyoite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Saarland
      • Wadern
        • Krettnich
    		Thomas Raber (2011) Tokyoit aus Krettnich, Saarland - Eine Mineralogische Städtepartnerschaft. Lapis Jg.26, Nr. 10, Pages 58 - 59
    Italy
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
            • Reppia
    		Bracco, R. (2003): Tamaite-O e tokyoite: due storie diverse, due minerali liguri in Giappone. Notiziario di Mineralogia del Ferrania Club, 17, 17-19; Bracco, R., Marchesini, M., Mezzano, I. (1999): Gambatesa 1999: l’anno del vanadio. Notiziario di Mineralogia del Ferrania Club, 13, 5-7.
      • La Spezia Province
        • Vara Valley
          • Borghetto Vara
    		Pavel M. Kartashov analytical data, material Castellaro Fabrizio
    Japan
     
    • Honshu Island
      • Kanto Region
        • Tokyo Prefecture
          • Nishi-Tama-gun
            • Okutama-cho
    		Am Min 90:1468
    • Kyushu Region
      • Nansei Archipelago
        • Kagoshima Prefecture
          • Amami-Oshima Island
    		Takashi Yamada, et al (2008) JAKOKA: 2008 Annual Meeting of the Japan Association of Mineralogical Sciences, R4-01.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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