Our beautiful Agate spheres are available in a variety of sizes! Agate is the banded form of Chalcedony, a micro-crystalline variety of Quartz. It forms in nodules, growing from the outer walls inward, creating beautiful translucent banding. Older Agates may appear opaque and less banded due to weathering and natural transformations within the minerals. Our high-quality Agate is mined directly from our Norcross-Madagascar (NMG) Agate Fields located in Ambarijeby, Madagascar.