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Graeserite

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JYJ615461

Graeserite

Description Tabs

Description
Locality: 
Monte Arsiccio Mine, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.89 × 2.2 × 2 cm
Description

Good crystals of the rare mineral gräserite in black crystals. 

References: confirmed by A. Lechner et al. 

Mineral Data
What's on the rock

Graeserite

Formula: 
(Fe3+ ,Ti)4Ti3AsO13(OH)
Strunz: 
4.JB.55
Crystal System: 
Monoclinic
Hardness: 
5.5
Colour: 
Black
Streak: 
Black
Type Locality: 
Gorb, Lercheltini area (Lärcheltini), Binn Valley, Wallis (Valais), Switzerland