Definitions for orpiment
This page provides all possible meanings and translations of the word orpiment
a yellow mineral occurring in conjunction with realgar; an ore of arsenic
arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment
Orpiment, As2S3, is a common monoclinic arsenic sulfide mineral. It has a Mohs hardness of 1.5 to 2 and a specific gravity of 3.49. It melts at 300 °C to 325 °C. Optically it is biaxial with refractive indices of a=2.4, b=2.81, g=3.02. Orpiment is an orange to yellow mineral that is found worldwide, and occurs as a sublimation product in volcanic fumaroles, low temperature hydrothermal veins, hot springs and as a byproduct of the decay of another arsenic mineral, realgar. It is often found in association with realgar. It takes its name from the Latin auripigmentum because of its deep yellow color.
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