TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY
Sphalerite. It is composed of zinc sulphate and the principal ore of zinc, it is found as either isometric tetrahedral crystals or in compact crypotocrystalline masses. Zinc extraction from sphalerite also yields cadmium, gallium and indium. The largest deposits are in North America and Australia.
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