EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Fluorapatite crystal, coloured scanning electron micrograph (SEM). Calcium fluoride phosphate, or fluorapatite, a form of apatite forms different crystal structures when grown under different conditions. Fluorapatite is used as an ingredient in toothpaste to transfer fluoride ions to tooth enamel and so strengthen it. Magnification: x4750 when printed at 10 centimetres wide.
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