DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Mimetite and galena crystals. Mimetite, lead chloro-arsenate, (yellow) is an attractive bright yellow mineral. Galena, lead sulphide, (grey) is a major source of lead. This sample is from Tsumeb, Namibia, and measures 5cm across. From Collection Royal Museum for Central Africa, Tervuren, Belgium.
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