Proustite crystals. Proustite (silver arsenic sulphide, or silver sulpharsenide) occurs worldwide in silver mines and is considered a primary ore of s

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Proustite crystals. Proustite (silver arsenic sulphide, or silver sulpharsenide) occurs worldwide in silver mines and is considered a primary ore of silver. It is a rare but spectacular mineral, notable for its intense crimson hue. However, it becomes dull black and opaque on exposure to oxygen, as with the sample shown here.

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Size: 5138px × 3425px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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