Agate is a largely translucent and variety of quartz and subvariety of chalcedony.
Agate consists mainly of chalcedony and sometimes in combination with variants of quartz. Think of variants of quartz: amethyst, smoky quartz, carnelian or jasper. Sometimes there is a combination of chalcedony with minerals such as calcite (calcium carbonate) and celadonite (belonging to the chlorite group).
Characteristic for an agate is the green outside around the inner bladder. This green exterior consists of minerals such as celadonite, chlorite and/or saponite.
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