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Tourmaline

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Watches:
MGR863978

Tourmaline

Description Tabs

Description
Locality: 
Mawi, Nuristan Province, Afghanistan
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 0.7 × 0.3 cm
Description

A dark blue crystal which shows violet color when backlit. The upper area shows blue to green color, which is visible without backlight.

Mineral Data
What's on the rock

Tourmaline

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