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Chisel bit

A tool used to cut or chip rock having chisel-shaped cutting edge at its tip

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Cement

Any calcined mixtures of clay and limestone, usually mixed with water, and gravel and/or sand

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Chert

Microcrystalline to cryptocrystalline sedimentary rock composed of interlocking quartz crystals

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Chelation

The reaction between a metallic ion and a complexing agent, with the resultant ring shaped structure forming a larger particle, useful in the disgorgement and transportation of embedded heavy metals from usually porous substrate