Ruby. Uncut ruby specimen. Ruby is a variety of corundum (aluminum oxide, Al2O3) whose red color is due to trivalent chromium (Cr3+) impurities. Corundum is defined to have hardness of 9 in the Mohs scale. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Turtle Rock Scientific |
Taille de l’image : | 5150 px × 3422 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |