Agate
Banding that moves slow, like time marked in stone.
- Stone
- Chalcedony (quartz)
- Major Sources
- Brazil, Uruguay, Mexico & Botswana
- Treatment
- Often dyed; we disclose treatments
Agate is banded chalcedony, a fine-grained quartz that fills cavities in volcanic rock one silica layer at a time. It's sold as raw nodules, geodes, slices and tumbled stones. Bright, flat pinks, blues and purples are usually dyed, while natural agate shows soft, layered color.
Read the Agate GuideBefore You Buy Agate
Natural or dyed?
Agate is porous and takes dye easily, and most bright pink, purple or blue agate in the trade is dyed. Natural agate shows softer, layered color. We disclose all treatments on the product page.
Why is every piece different?
Agate usually grows in cavities in volcanic rock, one thin layer of silica at a time. Traces of other minerals tint each layer, so bands differ in width and color and no two pieces match.
Are all agates banded?
Most are. Moss and dendritic agate show branching, plant-like patterns instead of bands, so strictly they aren't true agate, though the trade sells them as agate. Blue lace and crazy lace are named for their bands.
Care
At 6.5 to 7 on the Mohs scale, agate is tough and needs no special care. Wash it with mild soap, warm water and a soft brush, then dry it, and store it apart from softer stones.























































































































































































































































