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Sillimanite With Muscovite

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QRI957153

Description Tabs

Description
Locality: 
Cuzzago-Proman Pegmatite, Premosello Chiovenda, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 5.3 × 4.4 cm
Largest Crystal: 
2.50cm
Weight: 
165.00gr
Description

Well-formed crystal of blocky, prismatic grey sillimanite cropping out of the pale matrix. Very lustrous and rather clear of damage, it is associated to a few grey muscovite blades (var. sericite?) which locally pseudomorph the former. Very representative of this Alpine locality.

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

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Streak: 
White

Current price

$

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$10
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Start 19 Nov 18:00
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Shipping Information

Postage Area Price
Italy (Pacco Celere 3)
10
Europe/Mediterranean Basin (Tracked; Zone 1)
15
Americas, Asia, Africa (Tracked; Zone 2)
20
Australia & Oceania (Tracked; Zone 3)
25

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Shipping within 15 days after payment received, unless specified/agreed otherwise.

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