DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.