Opal is a hydrated amorphous variety of silica, chemical formula SiO2.nH2O) It is classified as a mineraloid, because of its amorphous habitat, as opposed to normal silica forms that are crystalline. Fire opal is a variety of the mineral opal characterized by fire-like yellow to orange red hues. It is a highly prized semi precious stone used in jewelry. Actual width is 45 mm. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5241 px × 3495 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |