Formula: Y(Ta,Ti,Nb)2O6
Multiple oxide containing niobium,
tantalum or titanium,
aeschynite group
Crystal System: Orthorhombic
Specific gravity: 5.75 to 6.13 measured, 6.39 calculated
Hardness: 5½ to 6
Streak: Black, light yellowish brown
Colour: Brownish black
RADIOACTIVE
Environments
At the type locality, the Raposa pegmatite, São José do Sabugi, Borborema mineral province, Paraíba, Brazil, tantalaeschynite occurs in
a pegmatite associated with quartz, microcline,
biotite, columbite and
beryl
(AM 59.1331-1332, HOM).
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