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Chalk: A biological limestone formed from shell debris
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Raw Limestone Chalk, Sedimentary Rock Specimen - Hand Sample - Approx. 3" - Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs: Amazon.com: Industrial & Scientific
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Chalk - Wikipedia
Chalk | Properties, Composition, Formation and Uses
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Chalk Rock Type, Composition, Formation, Occurrence & Uses
Chalk Rock | History | Origin
Chalk | Properties, Composition, Formation and Uses