Orpiment

Sulphide group

Formule chimique : As2S3

Système cristallin : Monoclinic

Etymologie : From the Latin "Auri" meaning "Gold" and "Pigmentum" meaning "Colour

Dureté : 1.5 – 2

Densité : 3.4 – 3.5

Propriétés physiques : Resinous to pearly luster, orange, brown to yellow, transparent to translucent, perfect cleavage

Propriétés chimiques : soluble in basic solution and aqua regia (mixture of concentrated hydrochloric acid and nitric acid)

Formule chimique : As2S3

Habitus : prismatic or kidney-shaped aggregates

Gîtologie : Orpiment is characteristic of low temperature hydrothermal deposits

Determination : Easy because of its almost systematic association with the realgar

Utilisation : no significant use

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