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Rock guide

Orpiment

mineral · uncommon

Quick facts

Formula
As2S3
Hardness
1.5–2
Luster
Resinous to pearly
Colors
Lemon-yellow to orange-yellow

Orpiment is an arsenic sulfide mineral known for its bright yellow color and association with realgar.

Identified by its bright yellow color, resinous luster, and association with arsenic minerals.

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