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Tourmaline

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RPL886991

Tourmaline

Description Tabs

Description
Locality: 
Buttern Hill Placers, Altarnun, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 4 × 5 cm
Largest Crystal: 
2.50cm
Weight: 
182.00gr
Description

Quartz is run through with many fine black and dark green straited crystals of tourmaline. Small amounts of orthoclase feldspar are present.

Mineral Data
What's on the rock

Tourmaline

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

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