Arsenic trisulfide, known for its bright lemon-yellow to orange color and foliated structure. Historically used as a pigment. It's associated with intellectual stimulation and manifestation. (Highly toxic, handle with extreme care).
Lemon-Yellow, Golden-Yellow, Orange-Yellow, Brownish-Yellow, often forms foliated masses
Orpiment is classified as a sulfide mineral mineral which typically crystallizes in the monoclinic system. Its chemical formula is As2S3. Common crystal habits include commonly in foliated columnar or fibrous aggregates; may be reniform or botryoidal; also granular or powdery; rarely as prismatic crystals.