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Uvite Dolomite & Quartz

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RBR161498

Uvite Dolomite & Quartz

Description Tabs

Description
Locality: 
Serra das Éguas, Brumado, Bahia, Brazil
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3 × 2 cm
Description

A choice dark green partly translucent lustrous single crystal of uvite on white dolomite. The crystal-color is very good, only a minimum ding on one side (but you have to look very close and careful to see it). Excellent termination and high aesthetic with a crystalsize of 1,2 cm.

Mineral Data
What's on the rock

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

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White