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Tourmaline

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TCT126862

Tourmaline

ex Peter Kingsmill

Description Tabs

Description
Locality: 
Megiliggar Rocks, Tremearne, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
2 × 5 × 2 cm
Largest Crystal: 
1.50cm
Description

A Cornwall rarity: tourmaline from the Megiliggar rocks (Tremearne pegmatite; http://www.mindat.org/loc-865.html). This small specimen is loaded with tourmaline crystals. Obviously not terminated but very nicely embedded in their contrasting matrix. Also the back hosts a couple of very nice and dark brown transparent crystals. Some nice negative tourmaline prints are present too in the host matrix too.

Mineral Data
What's on the rock

Tourmaline

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

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