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Princivalleite

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RSG1156745

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Description
Locality: 
Curiglia, Curiglia con Monteviasco, Varese Province, Lombardy, Italy
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.8 × 1.3 cm
Description

A massive crystal specimen of princivalleite, displaying a pale blue to bluish-grey coloration, typical of this rare sodic amphibole species. The mineral occurs as compact crystalline masses, without well-developed individual crystals, but with a clearly visible internal crystalline structure.

The surface shows a granular to slightly fibrous texture, with translucent zones alternating with more opaque areas, reflecting uneven crystal growth. The bluish tones are enhanced by a light-colored silicate-rich matrix, which contrasts nicely with the cool hue of the princivalleite.

 

In a box 2.8x2.8cm, labelled

FoV 3.5mm

Mineral Data
What's on the rock

Princivalleite

Formula: 
Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O
Crystal System: 
Trigonal
Colour: 
Light Blue
Type Locality: 
Curiglia, Curiglia con Monteviasco, Varese Province, Lombardy, Italy

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$10
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Start 17 Dec 18:00
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