Realgar in dolomite. Realgar is an orange-red, arsenic sulphide mineral, from which a large proportion of the world's arsenic is derived. Realgar is h

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Realgar in dolomite. Realgar is an orange-red, arsenic sulphide mineral, from which a large proportion of the world's arsenic is derived. Realgar is highly poisonous and has been used throughout history as both a pigment and a medicine. Dolomite (white) is a sedimentary calcium magnesium carbonate rock.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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