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Sillimanite

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QRI813485

Sillimanite

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Description
Locality: 
Cuzzago-Proman Pegmatite, Premosello Chiovenda, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 5.1 × 5.7 cm
Largest Crystal: 
1.60cm
Weight: 
103.00gr
Description

Well-formed crystal of bluish sillimanite cropping out of the pale matrix. Very lustrous and rather clear of damage, it is very representative of this Alpine locality, mostly known to specialists. 

Dated back to the 90s or even earlier.

 

Mineral Data
What's on the rock

Sillimanite

Formula: 
Al2(SiO4)O
Strunz: 
9.AF.05
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.5
Streak: 
white
Type Locality: 
Chester, Middlesex Co., Connecticut, USA

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