Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Tokyoite

Big Photo

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

Show Tokyoite Photos (8)
Formula:
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
System:MonoclinicColour:Red black
Hardness:4½ - 5
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
mindat.org URL:http://www.mindat.org/min-25633.html
Please feel free to link to this page.

Type Occurrence of Tokyoite

Type Locality:Shiromaru mine (Hakumaru mine), Okutama, 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)

Chemical Properties of Tokyoite

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

Relationship of Tokyoite to other Species

Member of Group:
Brackebuschite Group:
M
2+
2
M
3+
 
[OH|(TO
 
4
)
 
2
]
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bearthite
Ca
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
CuOHPO
 
4
(Mo,As,Cr,Ga)O
 
4
8.BG.05Tsumebite
Pb
 
2
Cu[OH|SO
 
4
|PO
 
4
]
8.BG.05Arsenbrackebuschite
Pb
 
2
(Fe
3+
 
,Zn
2+
 
)[(OH,H
 
2
O)|(AsO
 
4
)
 
2
]
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bushmakinite
Pb
 
2
Al[OH|PO
 
4
|VO
 
4
]
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
[OH|(VO
 
4
)
 
2
]
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
[OH|(PO
 
4
)
 
2
]
8.BG.15Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]

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

Search Engines:
  • Look for Tokyoite on Google
  • Look for Tokyoite images on Google
    • External Links:
  • Look for Tokyoite on Webmineral
  • Look for Tokyoite on Athena Mineralogy
  • Look for Tokyoite on Wikipedia
  • Look for Tokyoite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Tokyoite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
  • Fabre Minerals - search for Tokyoite specimens
  • Fine Minerals from Dan Weinrich Minerals
  • rare and unusual minerals mainly crystallized
  • Rare and Unusual minerals at Mineralogical Research Company
  • The Arkenstone - Fine Minerals
  • SpiriferMinerals.com - high quality specimens
  • Wendel Minerals - Auktion & Shop
  • High-end worldwide specimens & outstanding customer service
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy Fine Minerals from mineralsweb.com
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Buy Minerals and Crystals from Crystalarium.com
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Tokyoite

    Hide Locality List
    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.
    (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.
    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
    		Am Min 90:1468
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. 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. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 23rd Oct 2009 17:40:32