Tapiolite

Tapiolite
Tapiolite
General
Category	Mineral
Formula; (repeating unit)	(Fe, Mn)(Nb, Ta)2O6
IMA symbol	Tap
Crystal system	Tetragonal
Crystal class	Ditetragonal dipyramidal (4/mmm) ; H-M symbol: (4/m 2/m 2/m)
Space group	P42/mnm
Identification
References

Tapiolite [(Fe, Mn)(Nb, Ta)₂O₆] is a black mineral series that is an ore of niobium and tantalum. The tapiolite group includes tapiolite-(Fe) or ferrotapiolite and tapiolite-(Mn) or manganotapiolite.^[3]^[4]^[5] Tapiolite-(Fe) is by far the more common of the two.^[6]^[7]

The minerals have a submetallic luster and a high specific gravity with tapiolite-Fe having a higher specific gravity (7.90)^[6] versus 7.72 for tapiolite-Mn.^[7]

The mineral was named in 1863 after the forest god Tapio of Finnish mythology, and the original tapiolite material came from Sukula, Tammela, Tavastia Proper, Finland.^[3]^[8]

Tapiolite is very close to columbite and tantalite. Those minerals have the same chemical composition, but different crystal symmetry orthorhombic for tantalite or columbite and tetragonal for tapiolite.^[9]

Crystal structure of tapiolite

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Mineralienatlas
^ ^a ^b Mindat tapiolite group
^ Ferrotapiolite in the Handbook of Mineralogy
^ Manganotapiolite in the Handbook of Mineralogy
^ ^a ^b Tapiolite-Fe on Mindat
^ ^a ^b Tapiolite-Mn on Mindat
^ webmineral Tapiolite
^ P. Cerny et al. "The tantalite-tapiolite gap: natural assemblages versus experimental data" Canadian Mineralogist 30 (1992) 587 free download

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[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] Mineralienatlas

[Mindat-3] Mindat tapiolite group

[4] Ferrotapiolite in the Handbook of Mineralogy

[5] Manganotapiolite in the Handbook of Mineralogy

[MindatFe-6] Tapiolite-Fe on Mindat

[MindatMn-7] Tapiolite-Mn on Mindat

[8] webmineral Tapiolite

[9] P. Cerny et al. "The tantalite-tapiolite gap: natural assemblages versus experimental data" Canadian Mineralogist 30 (1992) 587 free download

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Tapiolite

References

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