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Tourmaline & Herderite

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MGR792087

Tourmaline & Herderite

Description Tabs

Description
Locality: 
Pederneira Mine, São José da Safira, Minas Gerais, Brazil
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 1.4 × 0.8 cm
Description

A very rare violet crystal from Pederneira - to be exactly a group of two inter-grown crystals. They are both end-pointed, sharp terminated and highly lustrous - and they show the very rare combination with Herderite.

Mineral Data
What's on the rock

Tourmaline

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

Herderite

Formula: 
CaBePO4(F,OH)
Strunz: 
8.BA.10
Crystal System: 
Monoclinic
Hardness: 
5.0 - 5.5
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany