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Tourmaline

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RPL625391

Tourmaline

Description Tabs

Description
Locality: 
Great Roughtor Consols, Davidstow Moor, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 5 × 4 cm
Largest Crystal: 
1.50cm
Weight: 
159.00gr
Description

A block of grey quartz and granite with some feldspar is run through with a myriad of black parallel crystals of tourmaline. Some sections of the tourmaline are missing leaving casts through the quartz.

Mineral Data
What's on the rock

Tourmaline

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

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