Galenite crystals

Galenite crystals

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Galenite crystals. Galenite (galena) is a lead sulphide and is the most important ore of lead. It occurs as a mass of dense, dark grey or glossy crystals and is one of the most abundant and widely distributed sulphide minerals. Galenite is a semiconductor and was used in early wireless communication systems as the crystal in crystal radio sets. Sample measures 30mm high and was found in Freiberg, Germany.

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