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agate a type of quartz that has forms or bands of different colors that look like clouds. [1/2 definitions]
amethyst a purple gem used in jewelry. Amethyst is a kind of quartz.
quartz Quartz is a hard mineral that can have beautiful crystals and comes in different colors. It is an important mineral because it is found in many rocks on the earth. Sand is often made out of very small grains of quartz.