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Tourmaline With Quartz & Mica

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PCZ687157

Tourmaline With Quartz & Mica

Description Tabs

Description
Locality: 
Aracuai, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 5 × 4.5 cm
Description

A number of groups of deep green, parallel tourmaline crystals jut out in various directions from a conglomeration of quartz crystals (up to 2,0 cm) and mica. great contrast and nicer than the images suggest.

Mineral Data
What's on the rock

Tourmaline

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

Quartz

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

Mica

Group Parent: 
Mica Group
Peter Crozier Minerals