Chalk (type of limestone)

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Chalk is a type of soft limestone that is composed of microscopic frustules of coccolithophores. Width of sample is 3 cm.

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Photo credit: © Siim Sepp / Alamy / Afripics
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Keywords: calcite, calcium, carbonate, chalk, coccolith, coccolithophor, construction, fossil, limestone, material, pebble, raw, resource, rock, sample, sedimentary