Close-up of quartz or silicon dioxide (SiO2),one of the most common minerals in the Earth's crust (12% by volume). The pure,colourless variety is also known as rock crystal and is highly prized by gemstone collectors. When it contains impurities,these impart a range of colours including white,yellow,pink,blue,green and smoky brown | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kinsman, Ted |
Taille de l’image : | 4368 px × 2912 px |
Model Release : | Non requis |
Restrictions : |
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