Agate

Agate is a banded variety of fibrous chalcedony. Agate stones are characterized by alternating bands of different colored chalcedony and often contain some visible quartz crystals. They are common in nature and can be found globally in a large number of different varieties.

Most agates are concentrically banded, while some have bands that form parallel lines.
Certain varieties of chalcedony without bands are commonly called agate, but these are not true agates.
Moreover, not every banded chalcedony is an agate.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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