Proustite crystals. Proustite (silver arsenic sulphide,or silver sulpharsenide) occurs worldwide in silver mines and is considered a primary ore of silver. It is a rare but spectacular mineral,notable for its intense crimson hue. However,it becomes dull black and opaque on exposure to oxygen,as with the sample shown here | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5138 px × 3425 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |