Nodule agate from Croatia

This agate nodule comes from Croatia. Agates are varieties of quartz that form mainly in the cavities of volcanic rocks. Their formation can date back several million years. This piece exhibits an open cut revealing characteristic concentric layers, with shades of grey, white and reddish. These colors are the result of various mineral impurities incorporated during the agate's growth. Nodules like this one are often sought after for their unique patterns and geological history.

This stone measures approximately 5 cm.