Blue lace agate. Cut and polished specimens are at top left,polished specimens are at right and a specimen in its natural state is at bottom left. Agate is silica (silicon dioxide) that precipitated from liquid inside existing rock. These successive layers of precipitation are seen as the deposited silica fills hollows in the rock | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biddle, Paul |
Taille de l’image : | 4724 px × 3753 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |