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Tokyoite

Big Photo

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

Show Tokyoite Photos (6)
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
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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

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.

Articles/Blogs about Tokyoite

Internet Links for Tokyoite

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    Localities for Tokyoite

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    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.
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    (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.
    Japan
     
    • Honshu Island
      • Kanto Region
        • Tokyo Prefecture
          • Nishi-Tama-gun
            • Okutama
    		Am Min 90:1468
    Mineral and/or Locality
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