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Anatase Brookite & Tourmaline

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SER1145560

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Description
Locality: 
Beura Quarries, Beura-Cardezza, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.1 × 5.1 × 4.5 cm
Description

a large display specimen featuring several black anatase crystals on adularia with thousands elongated brown tourmaline crystals and some grey flat brookite crystals too ; truly a very rich specimen

Mineral Data
What's on the rock

Anatase

Formula: 
TiO2
Strunz: 
4.DD.05
Hardness: 
5.5 - 6.0
Type Locality: 
St Christophe-en-Oisans, Bourg d'Oisans, Isère, Rhône-Alpes, France...

Brookite

Formula: 
TiO2
Strunz: 
4.DD.10
Crystal System: 
Orthorhombic
Hardness: 
5.5 - 6.0
Type Locality: 
Twll Maen Grisial, Fron Olau, Prenteg, Gwynedd (Caernarvonshire), Wales, UK

Tourmaline

Formula: 

A(D3)G6(T6O18)(BO3)3X3Z

Crystal System: 
Trigonal
Hardness: 
7

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Start 20 Jan 18:00
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