Chalk: A biological limestone formed from shell debris
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Chalk - Wikipedia
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Chalk | Properties, Composition, Formation and Uses
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Chalk Definition | History
Calcite
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Geological Society - Chalk cliffs, Sussex
Chalk: Mineral information, data and localities.
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Chalk under a Microscope - Procedures and Observations
Welcome to Stephen Hui Geological Museum
Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica
Chalk - Wikipedia
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