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Rankamaite & Simpsonite

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BCK684456

Rankamaite & Simpsonite

David Burgess Collection
Type Locality

Description Tabs

Description
Locality: 
Mumba Cassiterite Gravels, Mumba, Masisi Mountains, North Kivu, DR Congo
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 1.6 × 1.1 cm
Description

You are bidding on a small sample with some white, fibrous rankamaite in matrix and a partial vug with abundant yellow, translucent masses of rare simpsonite. 

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)

Simpsonite

Formula: 
Al4(Ta,Nb)3O13(OH,F)
Strunz: 
4.DC.10
Crystal System: 
Hexagonal
Hardness: 
7.0 - 7.5
Streak: 
white
Type Locality: 
Tabba Tabba pegmatite, Wallareenya Station, Port Hedland Shire, Western Australia, Australia

Seller Information

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