Barite,barium sulfate,is an important mineral in oil drilling but is seldom cut as a gemstone. The yellow gem from S. Dakota weighs 4.7 carats,the white stones from Colorado weigh 9.4 and 1.9 carats | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
Taille de l’image : | 3839 px × 2550 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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