Macrophotograph of sapphire or corundum. The mineral corundum or aluminium oxide occurs as well developed hexagonal crystals which may be arranged in prismatic,rhombohedral,pyramidal or tabular manner. Corundum is valued both as an abrasive (e.g. emery),& as a gemstone. Gemstones are fragments of certain minerals,artificially polished,which are hard,relatively free from cleavage & occur as transparent crystals. Transparent corundrum when tinted with blue,as here,is called sapphire. When coloured red it is called ruby. Magnification: x10 (6x4cm size) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Walsh, John |
Taille de l’image : | 3245 px × 4259 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |