Stone agates are type of quartz (silica), chiefly chalcedony, characterised by its fineness of grain and brightness of colour. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks which are the result of the transformation of a pre-existing rock types. Metamorphic rocks make up a large part of the Earth’s crust and are classified by texture and by chemical and mineral assemblage. Chalcedony is more soluble than quartz under low-temperature conditions, despite the two minerals being chemically identical.
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