chert - teaching student specimens of banded chert from the Monterey Formation, California - Unit of 5 specimens
Biochemical chert forms through the solution and reprecipitation of silica from diatom shells, while hydrothermal chert is a cryptocrystalline variety of quartz.
- The description claims that biochemical chert forms through the solution and reprecipitation of silica from diatom shells.
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