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Tapiolite-(Fe) – Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Brazil
(#:MINS8698)
An evident black crystals of tapiolite-(Fe) up to 5 mm is in good evidence outside the matrix, with a nice color contrast.
Formula :
(Fe^2+_,Mn^2+_)(Ta,Nb)
2
O
6
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).
Specimen weight:147 gr.
Crystal size:Up to 5 mm
Overall size: 52mm x 45 mm x 40 mm
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