DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Synthetic crystals of nickel ammonium sulphate (NiSO4(NH4)2.6H2O) Such crystals are made by precipitation from a solution of nickel in sulphuric acid. In this example the crystal precipitate is realized on a rock subsurface to suggest a natural origin of the crystals.
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