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Cassiterite & Tourmaline

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PDM739370

Cassiterite & Tourmaline

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Description
Locality: 
Busanga, Kolwezi, Haut-Katanga, DR Congo
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 4 × 2.5 cm
Description

Floater cassiterite crystals partially included in a quartz and tourmaline-rich matrix. The colour is brown and is formed by crystal faces or contacts with the matrix, but no damages. A perfectly located sample that was collected by Mr. Robert Verdoodt. He was working in the laboratories of UMHK in Lubumbashi, and travelled back to Belgium after the riots and the declaration of independence of Congo in 1960.

Beautiful example of an uncommon locality. It comes with a copy of a handwritten label, with number 42.

Mineral Data
What's on the rock

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7

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