Fluorine (or fluorite)

Halogen group

Formule chimique : CaF2
Système cristallin : Cubic
Etymologie : From the Latin word fluor, which means "to flow" and from its chemical composition, which is rich in fluorine.
Dureté : 4
Densité : 3.2
Propriétés physiques : Glassy sheen. Wide range of colours. Transparent. Blue or violet fluorescence under long UV light. 4 perfect cleavage planes according to the octahedron.
Propriétés chimiques : Insoluble in acids.
Formule chimique : CaF2
Habitus : Fluorite crystals are generally derived from the cubic form (from cube to octahedron). It can also be massive
Gîtologie : Fluorite is a ubiquitous mineral in hydrothermal veins. It can also be found in some pegmatites and sedimentary rocks.
Determination : Easy because of its shape derived from the cube and its 4 perfect cleavage planes.
Utilisation : Fluorite ore

Fluorite (a very common mineral) can be found in many regions of the world as well as in France where many deposits are known (Le Beix in Puy-de-dôme, Langeac in Haute-Loire, Le Burc in Aveyron…).

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