An agate is a beautiful and brightly colored rock. It is formed from a mineral called quartz.. Many other gemstones also same from quartz, including amethysts and onyx.
Agate is formed in holes or cracks in larger rocks. Sometimes agates are as small as peas. But some agates are more than two feet (61 cm) wide. Usually an agate has bands of different colors, one inside the other.
Agates used to be made into children’s marbles. That’s why some marbles are called agates or aggies. The main use for agate today is in objects such as lamp bases and paperweights.
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