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Tourmaline Var Schorl

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PDM832285

Tourmaline Var Schorl

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Description
Locality: 
Manono-Kitotolo Mine, Tanganyika, DR Congo
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2.7 × 1.8 cm
Description

Short prismatic, highly fractured tourmaline crystal of black colour with a net dark blue hue. When I found it in the Moors collection I thought it could be a pseudomorph so I sent it for analyses. The Raman test certified that it is a shorl tourmaline. Very rare species from this locality.

Specimen collected by Achiel Moors, a Belgian colonist in the D.R.Congo from 1957 to 1972.

Mineral Data
What's on the rock

Tourmaline

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

Schorl

Formula: 
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.0
Not Sold

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