Septarian Dragon Egg Stone Large pyrite crystal The unique blue coloration is

The unique blue coloration is caused by a copper substitution for calcium with white patterns or streaks

All of our copper pieces are from Northern Michigan

They are close relatives of sea urchins and heart urchins

This piece is polished into a mountain shape

Septarian Dragon Egg Stone Large pyrite crystal The unique blue coloration isSeptarian Dragon Eggs are septarian nodules that have been carved and polished into an palm stone shape. The natural cracked pattern gives a unique dragon skin look. These nodules start out as a ball of mud, when the mud dries out and cracks, minerals (primarily calcite and aragonite) fill in the cracks. Dimensions: 3. 75 L x 3. 75 W x 5. 75 H inches Weight: 3. 72 pounds