Blue Lace Agate Sterling Silver EarringsPale blue lace in mineral formthe bands so fine they read like fabric under glass. Blue Lace Agate is a banded chalcedony, a microcrystalline form of quartz, found in only one documented location: a single deposit in Namibia. Its delicate concentric banding in shades of cornflower, white, and dove grey forms through the slow infiltration of silica rich groundwater into volcanic cavities over millions of years. These oval cabochons are set in solid .