Raw turquoise
Numéro d’image : 13355546
| The mineral turquoise is a hydrated copper-aluminium phosphate, formed by precipitation from aqueous solutions in a host rock rich in copper and aluminium. It is amorphous (non- or crypto-crystalline) and has a characteristic blue green colour. It is of rare occurrence and since ancient cultures has always been highly valued as a gem for use in jewellery as well as religious and artistic crafts etc. This picture is of an unworked pebble from a locality in North Carolina, USA, well known as source of turquoise and other semi-precious stones. Actual width is 50 mm. | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Wiersma, Dirk |
| Taille de l’image : | 5438 px × 3744 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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