Iolite Sphere. This sphere also has specs of Sunstone. When it is taken in the sun and rocked back and forth, you can see small flashes of light reflecting. This is the Sunstone's aventurescense. Iolite is one of the few minerals with trichroism. Because of the way the spheres are cut and polished, much of the trichroism is not visible. Location: India. Dimensions: 1.86" in diameter. Weight: 144.1g. sku: 16F820.