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Tourmaline

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MGR715702

Tourmaline

Description Tabs

Description
Locality: 
Pederneira Mine, São José da Safira, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.9 × 2.4 × 1.3 cm
Description

A fine and very aesthetic cluster with two diagonal inter-grown crystals. The specimen shows a - for Pederneira - uncommon steel-blue color and glossy faces with fine stratiaton. The bottom of the vertical crystal was on the rock, the diagonal crystal is double terminated.

Mineral Data
What's on the rock

Tourmaline

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