Sapphire, SEM

Bildnummer 12310226
Sapphire, SEM
Coloured scanning electron micrograph (SEM) of an uncut sapphire. Sapphire is a typically blue gemstone variety of the mineral corundum (aluminium oxide). Sapphire is very dense and very hard. Non-gem quality sapphire is often used as an industrial abrasive, or as scratch-resistant glass. Magnification: x150 when shortest axis printed at 25 millimetres.
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Credit: Science Photo Library / DENNIS KUNKEL MICROSCOPY
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