Orpiment facts for kids
Orpiment is a mineral. Its chemical formula is As2S3. It is an orange to yellow mineral. It has a Mohs hardness of 1.5 to 2 and a specific gravity of 3.46. It melts at 300°C and oxidizes to arsenic trioxide at higher temperatures. It is toxic because it gets a layer of arsenic trioxide on it by oxidation in the air.
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Orpiment Facts for Kids. Kiddle Encyclopedia.