Classification of Tokyoite |
| IMA status: | Approved 2003 |
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| Strunz 8th edition ID: | 7/B.24-22
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| 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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| mindat.org URL: | http://www.mindat.org/min-25633.html Please feel free to link to this page. |
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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 |
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| General Appearance of Type Material: | Reddish brown micrograins and microcrystals |
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| Geological Setting of type material: | Metamorphosed low-grade sedimentary manganese ore |
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Occurrences of Tokyoite |
| Geological Setting: | Metamorphosed Mn ores. |
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Physical Properties of Tokyoite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Translucent |
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| Colour: | Red black |
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| Streak: | Deep brownish red |
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| Hardness (Mohs): | 4½ - 5 |
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| Hardness (Vickers): | VHN25=363 - 390 kg/mm2 |
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| Cleavage: | None Observed |
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| Density (calculated): | 4.62 g/cm3 |
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Crystallography of Tokyoite |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | P21/m {P1 1 21/m} {P21/m} {P1 21/m 1} |
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| Cell Parameters: | a = 9.104Å, b = 6.132Å, c = 7.895Å β = 112.2° |
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| Ratio: | a:b:c = 1.485 : 1 : 1.288 |
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| Unit Cell Volume: | V 408 ų |
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| Morphology: | Small aggregates of irregular grains. |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 3.31 | | (100) | | 2.80 | | (60) | | 2.71 | | (40) |
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Chemical Properties of Tokyoite |
| Formula: | |
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| Idealised Formula: | |
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| Essential elements: | Ba, H, Mn, O, V |
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| All elements listed in formula: | Ba, Fe, H, Mn, O, V |
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Relationship of Tokyoite to other Species |
| Member of: | Brackebuschite Group |
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Other Members of Group:
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Related Minerals - Nickel-Strunz Grouping):
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Other Names for Tokyoite |
| Synonyms: | |
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| Other Languages: | |
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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. |
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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. |
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Internet Links for Tokyoite |
| Search Engines: |
Look for Tokyoite on Google
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| External Links: | Look for Tokyoite on WebmineralLook for Tokyoite on Athena Mineralogy[Link Broken?]Look for Tokyoite on WikipediaLook for Tokyoite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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| Mineral Dealers: | The Arkenstone - Fine MineralsFine Minerals from Weinrich Minerals, Inc.Find Tokyoite on www.crystalclassics.co.ukBuy fine minerals and gemstones from Pala InternationalSearch for minerals at HeliodorSearch for - Tokyoite - on e-Rocks Mineral Sales & AuctionsBuy from David K Joyce mineralsHigh-end worldwide specimens & outstanding customer serviceSearch for Tokyoite from all mineral dealers at minfind.comwebmineralsWilensky Fine MineralsMineral Classics - Worldwide Collector Quality Minerals and Gems |
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| Jobs: | Mining & Geology Jobs |
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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
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