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  • A semi-precious chalcedony formed as quartz fossils of a previous geological age. The colors of agate can be clouded, clear or banded.
    Source: LITHICS-Net, Glossary of Lithics Terminology
  • Variety of chalcedony with alternating layers of chalcedony and opal.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  • A kind of silica consisting mainly of chalcedony in variegated bands or other patterns; commonly occupying vugs in volcanic and other rocks. AGI
  • 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. CF: onyx moss agate.
    Source: Dictionary of Mining, Mineral, and Related Terms

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