MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Galena (lead sulphide, PbS). This mineral usually occurs as compacted masses of cubic grey crystals, such as these, although some possess a rarer octahedral form. It is a common mineral found in various types of rocks, it is the most important lead ore and often contain deposits of silver. This specimen is from Madan, Bulgaria.
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