Definition of agate

An ornamental, translucent variety of quartz, known

for its spectacular colors and patterns. It is extremely finegrained

(or cryptocrystalline), and mixed with layers of opal,

which is another variety of colored silica that has combined

with variable amounts of water molecules. Opal is typically

iridescent, displaying changes in color when viewed in different

light or from different angles. Agate and opal typically

form colorful patterns including bands, clouds, or moss-like

dendritic patterns indicating that they grew together from silica-

rich fluids. Agate is found in vugs in volcanic rocks and is

commonly sold at rock and mineral shows as polished slabs

of ornamental stone.

See also MINERALOGY.

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