This complex Sphere is sculpted from Agate, a layered form of Chalcedony and Quartz that has been worked by sculptors for thousands of years. Theophrastus, a ancient Greek naturalist, bestowed the name Agate upon this fascinating stone. 3", 14-17 oz.Please Note: The item(s) you receive will match the quality of the one shown, but may vary slightly due to the nature of minerals.