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Rankamaite With Tantalite-(Mn)

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PDM1162767

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Description
Locality: 
Mumba Cassiterite Gravels, Mumba, Masisi Mountains, North Kivu, DR Congo
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.3 × 1 cm
Weight: 
5.00gr
Description

This is the last piece we have of such nice dense nugget with thousands of creamy white fibrous rankamaite crystals, associated to tabular blackish tantalite-(Mn) crystals of red reflexes. It comes from the Mumba deposits, the type locality from rankamaite.

Historical and very rare piece, collected in the 1960’s by Professor A. Delvaux (1919-1998). It comes with a copy of the original label, handwritten by Mr. Delvaux. Ex Albert Delvaux collection.

Combine specimens to reduce shipping costs!.

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)

Tantalite-(Mn)

Formula: 
MnTa2O6
Strunz: 
4.DB.35
Hardness: 
6.0
Type Locality: 
Utö Mines, Utö, Södermanland, Sweden

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Shipping Information

Postage Area Price
Belgium (Tracked)
7
NL, DE, FR, LU (Tracked)
10
EUROPE 1 . or 2 (Tracked)
11.12
CANADA (Tracked)
14
USA (NOT Tracked) . or USA (Tracked)
16
REST (Tracked)
14

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