DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Strontianite or strontium carbonate (SrCO3) is the main ore for extracting strontium used in TV screens and firework colours. It has orthorhombic crystals, white and off-white, more rarely spiky and radiating as here. From ClausthalZellerfeld in German Harz. Width 65mm.
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