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Tourmaline & Quartz

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SHS70046

Tourmaline & Quartz

Description Tabs

Description
Locality: 
Gunheath Pit, St Austell, Cornwall, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 7.2 × 4.2 cm
Description

Black tourmaline and quartz

Mineral Data
What's on the rock

Tourmaline

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White