The difference between Orpiment and Realgar
When used as nouns, orpiment means arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment, whereas realgar means a mineral, arsenic sulfide (ass), often associated with orpiment and stibnite in lead, silver and gold ores.
check bellow for the other definitions of Orpiment and Realgar
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Orpiment as a noun:
arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment
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Realgar as a noun (mineral):
A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.