MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
Wulfenite. Cut and polished crystals of the minerals wulfenite (paler translucent blocks) and mimetite (brighter orange). Wulfenite (or yellow lead ore) consists of lead molybdate. It tends to form tetragonal (four-sided) crystals, as seen here. It is a minor source of the metal molybdenum. Mimetite is an arseniate of lead and forms hexagonal crystals.
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