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Rankamaite

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CAM133691

Rankamaite

Type Locality

Description Tabs

Description
Locality: 
Mumba Cassiterite Gravels, Mumba, Masisi Mountains, North Kivu, DR Congo
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.4 × 1.2 cm
Description

A good coverage of creamy-white fibrous rankamaite on matrix. A fine example of this rare and complex tantalum-niobium-oxide from the Type Locality

Mineral Data
What's on the rock

Rankamaite

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

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