Calcite
Carbonate group
Formule chimique :
CaCO3
Système cristallin :
Rhombohedral
Etymologie :
From Latin calcis which means lime.
Dureté :
3 – 4
Densité :
2.71 – 2.94
Propriétés physiques :
Vitreous and pearly sheen on cleavages. Colorless to yellow, up to brown. Transparent. Fluorescent. Cleavage according to (1010) perfect.
Propriétés chimiques :
Soluble with effervescence in hydrochloric acid (HCl) when cold.
Formule chimique :
CaCO3
Habitus :
Often crystallized in rhombohedrons, in scalenohedrons,... Butterfly and heart-shaped macles.
Gîtologie :
Calcite is a ubiquitous mineral present in carbonates and in metalliferous veins. Calcite is the main constituent of limestone and marble.
Determination :
Relatively easy due to perfect cleavages and effervescence with cold HCl.
Utilisation :
No major use
A polymorph of aragonite, calcite can be found in virtually every geological setting around the world.
Stamp of Afghanistan of 1999 representing a group of crystals of calcite
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