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Rankamaite

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Rankamaite

Description Tabs

Description
Locality: 
Urubu mine, Monte Belo, Itinga, Minas Gerais, Brazil
Size Range: 
Micromount (under 1cm)
Size: 
0.3 × 0.3 × 0.2 cm
Description

Rankamaite in capsula

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)