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chalcedony
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Calcite and barite actually crystallize after the formation of chalcedony and quartz cease and often infill or possibly cause subsequent fracturing of the agate.
In the spring of 1968, Stepanov together with amateurs B. Kantor and E. Kurdyukov discovered the now-famous manifestation of hollow agates with chalcedony pseudostalactites in the Moscow region.
In fact, seventeen of the fifty-seven sites are specifically listed for agate, chalcedony , chert, jasper, or petrified wood.
The depictions of birds and flowers were executed in precious materials including lapis lazuli, agate, Sicilian red and green jasper, chalcedony , amethyst and quartz as well as superb hard stones.
Groutite is observed as small, lustrous black, acicular crystals to 1/8 inch long that occur directly on the quartz or chalcedony .
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