Grossular

Garnet group - Mesosilicates

Formule chimique : Ca3Al2(SiO4)3.
Système cristallin : Cubic
Etymologie : From the Latin grossularia which means gooseberry in relation to the colour of some grossularia.
Dureté : 6.5 – 7
Densité : 3.4 – 3.6
Propriétés physiques : Glassy sheen. White, green, pink, brown and orange. Transparent to translucent. Conchoidal fracture.
Propriétés chimiques : Insoluble in acids.
Formule chimique : Ca3Al2(SiO4)3.
Habitus : Often in dodecahedral rhomboidal crystals.
Gîtologie : Grossular garnet is found in metamorphic limestone rocks such as skarns.
Determination : difficult to differentiate from other garnet varieties.
Utilisation : Because of its hardness, garnet can be used as an abrasive. When it is of gem quality, it can be used in jewellery.

The grossular belongs to the family of calcic garnets of which it is the aluminous pole and forms a continuous series with andradite (iron pole) and ouvarovite (chromium pole). In the world, grossular garnet can be found in Mexico (Morelos), South Africa, Kenya (tsavorite, vanadiferous variety), Tanzania and Pakistan.

In France, the grossular garnet is found mainly in the Pyrenees.

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