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Tapiolite-(Fe) – Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Brazil (#:MINS9306)

An evident black crystals of tapiolite-(Fe) up to 7 mm in good evidence outside the matrix, with a nice color contrast.

Formula :
(Fe^2+_,Mn^2+_)(Ta,Nb)₂O₆
System: tetragonal Hardness:6-6½ Rarity:rare
Strunz id:IV/D.4-10 - OXIDES and HYDROXIDES
Name origin: Nils Adolf Erik Nordenskiöld named tapiolite in 1863 after Tapio, Finnish god of the forest as the original material was from a granite pegmatite prospect located close to the Kumala farm in the town of Sukula in Finland. Renamed ferrotapiolite in 1983 to distinguish it from manganotapiolite. Later renamed tapiolite-(Fe).