ORPIMENT![]() from Utah, USA | This mineral forms small, prismatic crystals, though only rarely. More frequently, it occurs as thin, foliated masses, or in massive, or columnar habits. The colour is usually a rich lemon-yellow, though it can be brownish yellow. It is found in low temperature hydrothermal veins, often with stibnite and realgar. Orpiment also forms in the crusts deposited around hot springs. Hardness: 1 1/2 - 2 Oh yeah. And Orpiment's chemical formula is As2S3. Know what the As is?? ARSENIC!!!
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