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6-16-2017 You really need a couple of books and some experience to get a complete answer to this. Agate is quartz, which is natural glass, except that agate is the crystal form. The non-crystal form is called jasper. Both forms might contain other minerals, so they can be very colorful. In some areas, agate is called onyx. Agate is often used to make bearings for precision scales and other scientific equipment.
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