# Tokyoite

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Tokyoite
> Markdown URL: https://mediated.wiki/source/Tokyoite.md
> Source: https://en.wikipedia.org/wiki/Tokyoite
> Source revision: 1310721748
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Barium manganese vanadate mineral}}
{{About|mineral|resident of Tokyo|Tokyojin|and|Edokko}}
{{infobox mineral
| name      = Tokyoite
| category  = Vanadate mineral
| image       = Tokyoite displayed at Mining Museum of Akita University.jpg
| imagesize   = 250
| caption     = Tokyoite ore displayed at the Mining Museum of [Akita University](/source/Akita_University), Japan
| formula     = Ba<sub>2</sub>(Mn<sup>3+</sup>,Fe<sup>3+</sup>)OH(VO<sub>4</sub>)<sub>2</sub>
| IMAsymbol   = Tky<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
| molweight   = 
| strunz      = 8.BG.05
| dana        =
| system      = [Monoclinic](/source/Monoclinic) 
| class       = Prismatic (2/m) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| unit cell   = a = 9.104&nbsp;[Å](/source/%C3%85ngstr%C3%B6m), b = 6.132&nbsp;Å <br/>c = 7.895&nbsp;Å; β = 112.2°; Z&nbsp;=&nbsp;2
| color       = Reddish black
| colour      = 
| habit       = Occurs as splotchy, anhedral crystals forming inclusions
| twinning    = 
| cleavage    = None observed
| fracture    = 
| tenacity    =
| mohs        = 4.5 - 5
| luster      = Vitreous
| streak      = Deep brownish red
| diaphaneity = Translucent
| gravity     = 4.62 calculated
| density     = 
| polish      = 
| opticalprop = Biaxial (?)
| refractive  = a=1.99, g=2.03
| birefringence = 0.0400
| pleochroism = Distinct, reddish orange to dark brownish red
| 2V          = 
| dispersion  = 
| extinction  = 
| length fast/slow =
| fluorescence= 
| absorption  =
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| other       = 
| alteration  = 
| references  = <ref name=Mindat>[http://www.mindat.org/min-25633.html Mindat]</ref><ref name=Webmin>[http://www.webmineral.com/data/Tokyoite.shtml Webmineral data]</ref><ref name=Matsubara>[http://rruff.geo.arizona.edu/doclib/jmps/vol99/JMPS99_363.pdf Matsubara, Satoshi, et al., ''Tokyoite, Ba2Mn3+(VO4)2(OH), a new mineral from the Shiromaru mine,'' Journal of Mineralogical and Petrological Sciences, V. 99, pp. 363-7, 2004]</ref>
}}
'''Tokyoite''' is a rare [barium](/source/barium) [manganese](/source/manganese) [vanadate](/source/vanadate) mineral with the [chemical formula](/source/chemical_formula): Ba<sub>2</sub>(Mn<sup>3+</sup>,Fe<sup>3+</sup>)OH(VO<sub>4</sub>)<sub>2</sub>. It is the manganese analogue of the iron rich [gamagarite](/source/gamagarite)<ref name=Webmin/> and the barium analogue of the lead vanadate, [brackebuschite](/source/brackebuschite).<ref name=Matsubara/>

It occurs in low-grade [metamorphosed](/source/Metamorphism) sedimentary manganese [ore deposit](/source/ore_deposit)s<ref name=Mindat/> associated with [hyalophane](/source/hyalophane), [braunite](/source/braunite) and tamaite.<ref name=Matsubara/>

It was first reported for an occurrence in the Shiromaru Mine, Okutama, Tama district, [Tokyo Prefecture](/source/Tokyo_Prefecture), [Kantō region](/source/Kant%C5%8D_region), [Honshu Island](/source/Honshu_Island), [Japan](/source/Japan) and approved by the [IMA](/source/International_Mineralogical_Association) in 2003.<ref name=Webmin/> It has been found in two mines in [Italy](/source/Italy) and one in [Japan](/source/Japan), for which it was named.<ref name=Mindat/>

==References==
{{Reflist}}

Category:Barium minerals
Category:Manganese minerals
Category:Hydroxide minerals
Category:Vanadate minerals
Category:Monoclinic minerals
Category:Minerals described in 2003

{{mineral-stub}}

---
Adapted from the Wikipedia article [Tokyoite](https://en.wikipedia.org/wiki/Tokyoite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Tokyoite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.