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Rankamaite

Type Locality
Mumba cassiterite gravels, Mumba, Masisi Mts, Nord-Kivu, Democratic Republic of Congo (Zaïre)
Mineral Data
(Na,K)3(Ta,Nb,Al)11(O,OH)31
Strunz: 
4.DM.05
Physical Properties
Crystal System: 
Orthorhombic Water-worn pebbles.
Hardness: 
3.0 - 4.0