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Rankamaite & Thoreaulite

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SKY1151424

Description Tabs

Description
Locality: 
Ognevka Deposit, Ulan, Kalba Range, Eastern Kazakhstan Province, Kazakhstan
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1 × 0.7 cm
Description

White crystal aggregates of rankamaite associated to yellow thoreaulite from Kazakhstan.

Two very rare Nb-Ta minerals in a single specimen!

Ex. Erich Laskowski collection (USA) .

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)

Current price

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28
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Start 23 Jan 18:00
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Shipping Information

Postage Area Price
Spain
7
Europe (up to 250g).
15
USA (up to 250g). No duties or taxes applied
20
Rest of the World (up to 250g).
22

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Bid History

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