Tapiolite

General Information: Chemical Formula:(Fe,Mn)(Ta,Nb)2O6 Composition:(Molecular Weight = 513.74 gm)Tantalum 70.44 % TaIron 10.87 % FeOxygen 18.69 % O  Empirical Formula: Fe2+Ta2O6 Environment:Pegmatites and alluvial deposits. IMA Status:Not IMA Approved Locality:Sukkula, Finland. Name Origin:Named after the god Tapio of Finnish mythology.Physical Properties: Cleavage:[110] Imperfect Color:black. Density:8.17 Diaphaniety:Opaque Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., , Hardness:6-6.5 - Orthoclase-Pyrite Luminescence:Non-fluorescent. Luster:Metallic Streak:brownMore details...

General Information: Chemical Formula:(Fe++,Mn++)(Ta,Nb)2O6 Environment:Pegmatites and alluvial deposits. IMA Status:Approved IMA Locality:Sri Lanka. Name Origin:Named after the god Tapio of Finnish mythology and the Latin ferrium - "iron."Physical Properties: Cleavage:[110] Imperfect Color:brownish black or black. Density:7.82 Diaphaniety:Opaque Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Disseminated - Occurs in small, distinct particles dispersed in matrix., Hardness:6 - Orthoclase Luminescence:None. Luster:Metallic Streak:brownMore details...

(Fe,Mn)(Ta,Nb)2O6