Tapiolite
Script error: No such module "Infobox".Script error: No such module "Check for unknown parameters". 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.[1][2][3] Tapiolite-(Fe) is by far the more common of the two.[4][5]
The minerals have a submetallic luster and a high specific gravity with tapiolite-Fe having a higher specific gravity (7.90)[4] versus 7.72 for tapiolite-Mn.[5]
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.[1][6]
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.[7]
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References
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- ↑ 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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