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Tourmaline Var Schorl

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PCZ751730

Tourmaline Var Schorl

Description Tabs

Description
Locality: 
Erongo Mountains, Karibib, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.8 × 1.8 cm
Description

A sharp, highly reflective, schorl tourmaline crystal section on matrix. much nicer than the images suggest (the white flecks seen are not visable to the naked eye).

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
Peter Crozier Minerals