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One of the layered agates most commonly available is blue lace agate, where layers of blue chalcedony are interlayered with colourless or white chalcedony.These Agates are usually colorless, white, or gray, and have tree- or fern-like inclusions of iron or manganese, called dendrites.These Agates are usually colorless, white, or gray, and have tree- or fern-like inclusions of iron or manganese, called dendrites.Agate is the banded form of the mineral Chalcedony, which is a microcrystalline variety of Quartz.Although they can form in all types of host rock, most of the world's agates developed in ancient volcanic lava.When Chalcedony in concentrically banded it is called an Agate.
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