MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Pyrite (iron sulphide) nodule sectioned to show the internal radiating crystals. Pyrite is the most widespread sulphide mineral (FeS2). It occurs in magnificent crystals world wide, notably Rio Tinto (Spain) & Colorado & Arizona (USA). It forms striated, cubic, octahedral or pyritohedral crystals and occurs in plutonic, volcanic, sedimentary & metamorphic rocks.
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