Amethyst specimen from China. Amethyst is a semiprecious stone. It is a violet or purple form of quartz (silica or silicon dioxide, SiO2). | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Turtle Rock Scientific |
Taille de l’image : | 5165 px × 3442 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |