Sodalite Group

Formule chimique : Na8Al6Si6O24Cl2
Système cristallin : Cubic
Etymologie : because of its chemical composition which contains sodium, hence Soda in Latin which means soda and Lithos which means stone in Greek
Dureté : 5.5 – 6
Densité : 2.1 – 2.4
Propriétés physiques : Vitreous to greasy luster, colour: colorless to dark blue, may be greenish and reddish, colorless trace, transparent to translucent, poor cleavage
Propriétés chimiques : Soluble in acids
Formule chimique : Na8Al6Si6O24Cl2
Habitus : Often in massive clusters and more rarely in the form of dodecahedrons
Gîtologie : Sodalite is always associated with silica-undersaturated and alkaline-rich magmatic rocks.
Determination : Difficult
Utilisation : No major use

The finest sodalite comes from Ontario, Canada, and Afghanistan, as well as from Minas Gerais, Brazil. In France, sodalite has been described in the Hautes-Pyrénées and in the Cantal.

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