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. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / DENNIS KUNKEL MICROSCOPY |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |