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Stilbite With Quartz

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QRI859517

Stilbite With Quartz

Classic Locality

Description Tabs

Description
Locality: 
Veny Valley, Monte Bianco, Courmayeur, Aosta Valley, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 5.7 × 3.1 cm
Largest Crystal: 
1.70cm
Weight: 
90.00gr
Description

Several radial aggregates and spheroids of yellow stilbite elegantly perched on a quartz laden metamorphic matrix of thsi Mont Blanc specimen. The contrast is striking and the quality of the stilbite is really good.

Stilbite from Mont Blanc is quite sought-after, and this specimen is very rich. It comes from a very limited batch of specimens I have been able to acquire from a retired Italian strahler earlier this summer.

Mineral Data
What's on the rock

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

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