Agate
Agate
A kind of silica consisting mainly of chalcedony in variegated bands or other patterns; commonly occupying vugs in volcanic and other rocks.
A translucent cryptocrystalline variety of variegated chalcedony commonly mixed or alternating with opal and characterized by colors arranged in alternating stripes or bands, in irregular clouds, or in mosslike forms; occurs in virtually all colors, generally of low intensity, in vugs in volcanic rocks and cavities in some other rocks. moss agate.