Gypsum
Sulphate group
Formule chimique :
CaSO4.H2O.
Système cristallin :
Monoclinic
Etymologie :
From the Greek gupsos which means plaster.
Dureté :
2
Densité :
2.3
Propriétés physiques :
Glassy sheen. Colourless yellow to brown. Transparent to translucent. Pearly sheen. White streak. Lamellar fracture. Very clear cleavage (010).
Propriétés chimiques :
soluble in hydrochloric acid (HCl) and slightly in water.
Formule chimique :
CaSO4.H2O.
Habitus :
In thin to thick tabular crystals mottled in a "spearhead" or "swallowtail" pattern.
Gîtologie :
Gypsum is mainly found in sedimentary deposits and evaporitic deposits.
Determination :
Its low hardness (scratchable with a fingernail) and its very clear lamellar cleavage are characteristic.
Utilisation :
Gypsum is found in many places around the world.
In France, it is found in the Paris basin, Lorraine and the edge of the Massif Central.
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