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Cookeite & Tourmaline

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SHS89871

Cookeite & Tourmaline

Description Tabs

Description
Locality: 
Golconda Pegmatite, Governador Valadares, Minas Gerais, Brazil
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 2.8 × 2.5 cm
Description

Cookeite crystals on two tourmaline crystals with a bit of albite.

Mineral Data
What's on the rock

Cookeite

Formula: 
(Al2Li)Al2(AlSi3O10)(OH)8
Strunz: 
9.EC.55
Hardness: 
2.5 - 3.5
Streak: 
White
Type Locality: 
Mount Mica Quarry (Mount Mica Mine), Paris, Oxford Co., Maine, USA

Tourmaline

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