Blue Agate Stone: A form of banded chalcedony, a mineral in the quartz family, is called blue agate. Typically, it is banded in layers of primarily light blue, striped with brighter blues, whites, and occasionally brown colour threads. If agate has attracted your attention, it’s understandable; these impossible-to-ignore gemstone surfaces make a statement in any setting while also providing a wealth of useful and enjoyable advantages. Although they are a well-liked standout, blue agate countertops are by no means the sole choice.