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Minor sulphide ore for arsenic, As2S2, associated with orpiment (As2S3) to which realgar changes on exposure; sp. gr. 3.6; hardness 1.5–2.0 (can be cut with a knife); monoclinic; red, varying to orange and yellow, transparent to translucent; orange-red streak; resinous lustre; crystals rare, short, striated, and prismatic, also occurs granular, compact, or massive; cleavage good pinacoidal; also found at hot springs and in limestones and dolomites; alters to yellow powder.

Subjects: Earth Sciences and Geography.

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