DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Pyrite crystal surface. Close-up showing the regular patterning caused by the crystal structure of this mineral. The lines mark the outline of the crystal planes that grow, layer-by-layer on top of each other to form the overall structure. Pyrite (iron sulphide) can form several types of symmetry in its crystals. These lines are caused when the cubic form and pyritohedron forms mix. The area seen is just over 2 centimetres across.
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