DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Galenite crystals. Galenite (galena) is a lead sulphide and is the most important ore of lead. Galenite occurs as a mass of dense, dark grey or glossy crystals and is one of the most abundant and widely distributed sulphide minerals. One of the earliest uses of galenite was as kohl, which Ancient Egyptians applied around the eyes to reduce the glare of the sun and repel flies. Galenite is a semiconductor and was used in early wireless communication systems as the crystal in crystal radio sets.
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