Amethyst crystals,a variety of quartz,(silicon dioxide). The purple colour in amethysts is caused by the presence of compounds of iron or manganese. It is often used as a gemstone in jewellery,especially in rings. Although amethyst is found in Europe and North America,the finest specimens occur in India,Sri Lanka and Brazil | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Lawry, Lawrence |
Taille de l’image : | 4173 px × 3360 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |