Chalk - Wikipedia
Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts …
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Chalk (Sedimentary Rock): Formation, Composition & Uses
Jan 16, 2026 · Chalk is a soft, white sedimentary rock formed from marine microfossils. Learn its formation, mineral composition, properties, famous deposits, and uses.
CHALK Definition & Meaning - Merriam-Webster
May 14, 2026 · : a prepared form of chalk or a material resembling chalk especially when used (as for writing on blackboards) as a crayon
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Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica
chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest …
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Where Does Chalk Come From and How Is It Formed?
Nov 28, 2025 · Chalk is a soft, white, porous sedimentary rock, a unique type of limestone composed almost entirely of the mineral calcite (calcium carbonate). This fine-textured rock, distinguished by its …