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Tourmaline Var Uvite

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ESM218048

Tourmaline Var Uvite

Description Tabs

Description
Locality: 
St Lawrence County, New York, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 5.3 × 4.1 cm
Description

Cluster of lustrous crystals

Mineral Data
What's on the rock

Tourmaline

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

Uvite

Formula: 
Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Group Parent: 
Tourmaline
Crystal System: 
Trigonal
Hardness: 
7.5
Colour: 
Black, greenish-black
Streak: 
Light-brown, light-green, or white
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