# Tapiolite

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> Markdown URL: https://mediated.wiki/source/Tapiolite.md
> Source: https://en.wikipedia.org/wiki/Tapiolite
> Source revision: 1310227737
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{{Infobox mineral
| name        = Tapiolite
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| image       = Tapiolite-121701.jpg
| imagesize   = 260
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| formula     = ([Fe](/source/iron), [Mn](/source/manganese))([Nb](/source/niobium), [Ta](/source/tantalum))<sub>2</sub>[O](/source/oxygen)<sub>6</sub>
| IMAsymbol   = Tap<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>
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| system      = Tetragonal
| class       = Ditetragonal dipyramidal (4/mmm) <br/>[H-M symbol](/source/H-M_symbol): (4/m 2/m 2/m)
| symmetry    = ''P''4<sub>2</sub>/mnm
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| references  = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Tapiolite Mineralienatlas]</ref>
}}
'''Tapiolite''' [([Fe](/source/iron), [Mn](/source/manganese))([Nb](/source/niobium), [Ta](/source/tantalum))<sub>2</sub>[O](/source/oxygen)<sub>6</sub>] is a black [mineral](/source/mineral) series that is an ore of [niobium](/source/niobium) and [tantalum](/source/tantalum). The tapiolite group includes tapiolite-(Fe) or ferrotapiolite and tapiolite-(Mn) or manganotapiolite.<ref name=Mindat>[http://www.mindat.org/min-3887.html Mindat tapiolite group]</ref><ref>[http://rruff.info/doclib/hom/ferrotapiolite.pdf Ferrotapiolite in the Handbook of Mineralogy]</ref><ref>[http://rruff.info/doclib/hom/manganotapiolite.pdf Manganotapiolite in the Handbook of Mineralogy]</ref> Tapiolite-(Fe) is by far the more common of the two.<ref name=MindatFe>[http://www.mindat.org/min-1531.html Tapiolite-Fe on Mindat]</ref><ref name=MindatMn>[http://www.mindat.org/min-2523.html Tapiolite-Mn on Mindat]</ref>

The minerals have a submetallic [luster](/source/Lustre_(mineralogy)) and a high [specific gravity](/source/specific_gravity) with tapiolite-Fe having a higher specific gravity (7.90)<ref name=MindatFe/> versus 7.72 for tapiolite-Mn.<ref name=MindatMn/>

The mineral was named in 1863 after the forest god [Tapio](/source/Tapio_(spirit)) of Finnish mythology, and the original tapiolite material came from [Sukula](/source/Sukula), [Tammela](/source/Tammela%2C_Finland), [Kanta-Häme](/source/Kanta-H%C3%A4me), [Finland](/source/Finland).<ref name=Mindat/><ref>[http://webmineral.com/data/Tapiolite.shtml webmineral Tapiolite]</ref>

Tapiolite is very close to ''[columbite](/source/columbite)'' and ''[tantalite](/source/tantalite)''. Those minerals have the same chemical composition, but different crystal symmetry [orthorhombic](/source/orthorhombic) for tantalite or columbite and [tetragonal](/source/tetragonal) for tapiolite.<ref>P. Cerny et al. "The tantalite-tapiolite gap: natural assemblages versus experimental data" Canadian Mineralogist 30 (1992) 587 [http://rruff.geo.arizona.edu/doclib/cm/vol30/CM30_587.pdf free download]</ref>

{{Gallery
|align=right
|File:Tapiolite.GIF|Crystal structure of tapiolite
}}

==References==
{{reflist}}

{{Manganese minerals}}

Category:Tantalum minerals
Category:Niobium minerals
Category:Iron(II) minerals
Category:Manganese(II) minerals
Category:Oxide minerals
Category:Tetragonal minerals
Category:Minerals in space group 136
Category:Minerals described in 1863

{{oxide-mineral-stub}}

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