Oregon Thunderegg Mineral Specimen Display

A genuine Oregon Thunderegg — one of nature's most fascinating geological surprises. From the outside, Thundereggs look like ordinary lumpy rocks, but slice one open and you'll discover a stunning interior of agate, jasper, or crystalline quartz in swirling patterns and colors. Oregon is famous for its Thundereggs, and each one tells a unique story millions of years in the making.

• Authentic Oregon Thunderegg specimen
• Sliced and polished to reveal the beautiful interior
• Interior features agate, jasper, or quartz formations
• Oregon's official state rock
• A truly one-of-a-kind display piece