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Spinel & Norbergite

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SER851733

Spinel & Norbergite

Description Tabs

Description
Locality: 
San Vito Quarry, Ercolano, Monte Somma, Somma-Vesuvius, Naples, Campania, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.5 × 1.1 cm
Description

a purple spinel crystal with some colourless norbergite crystals 

Mineral Data
What's on the rock

Spinel

Formula: 
MgAl2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
7.5 - 8.0

Norbergite

Formula: 
Mg3(SiO4)(F,OH)2
Strunz: 
9.AF.40
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 6.5
Type Locality: 
Östanmossa mine, Röberg ore field, Norberg, Västmanland, Sweden