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Rankamaite & Thoreaulite

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SHS80009

Rankamaite & Thoreaulite

Description Tabs

Description
Locality: 
Urubu mine, Monte Belo, Itinga, Minas Gerais, Brazil
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.3 × 1.6 cm
Description

White rankamaite and brown thoreaulite on matrix.

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)

Thoreaulite

Formula: 
(Sn2+,Pb)(Ta,Nb)2O6
Strunz: 
4.DG.15
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0
Type Locality: 
Manono Mine, Katanga (Shaba), Democratic Republic of Congo (Zaïre)