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Tourmaline Var Schorl On Feldspar

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FCM769891

Tourmaline Var Schorl On Feldspar

Fluorescent

Description Tabs

Description
Locality: 
Erongo Mountains, Karibib, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 7 × 4.5 cm
Largest Crystal: 
5.00cm
Description

This specimen features a lustrous black 5 cm striated schorl crystal on pinkish feldspar matrix.  The feldspar exhibits red fluorescence under SW UV light.  

Previous labels supplied (not photographed)
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

Feldspar

Group Parent: 
Feldspar Group

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