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Sillimanite With Titanite

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QRI865492

Sillimanite With Titanite

Description Tabs

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 × 4.4 × 4 cm
Largest Crystal: 
0.70cm
Weight: 
103.00gr
Description

Well formed crystal of brownish sillimanite cropping out of the pale pegmatitic matrix, often tectonized. Moderately lustrous and rather clear of damage, it is very representative of this Alpine locality, mostly known to specialists. Associated, a sizeable yellow titanite crops out of matrix, in good conditions and with good lustre.

Dated back to the 90s or even earlier. A nice, balanced specimen from this Italian locality.

 

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

Titanite

Formula: 
CaTi(SiO4)O
Strunz: 
9.AG.15
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Titanite occurrence, Hauzenberg, Lower Bavaria, Bavaria, Germany

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