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Orpiment

Chemical Formula

As2S3

Chemical Class

Sulfides

Properties

Orange yellow color mineral, lemon yellow and brownish yellow, with pearlescent or resin gloss, it has low hardness, 1.5 to 2, and 3.49 density.

Origin

Nevada, USA.

Curiosities

Due to low hardness and its unique and intense color, it was widely used as yellow gold pigment in several 18th century constructions.

Use

It is an arsenic (As) source mineral, and it is also very appreciated by collectors and museums.

Source: MM Gerdau - Museu das Minas e do Metal -

ABC of mining

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