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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 …

Find durable, break-resistant chalk that delivers vibrant colors and crisp lines. Shop bulk sets and individual packs.

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 …

: a prepared form of chalk or a material resembling chalk especially when used (as for writing on blackboards) as a crayon

Jan 16, 2026 · Chalk is a soft, white sedimentary rock formed from marine microfossils. Learn its formation, mineral composition, properties, famous deposits, and uses.

The primary purpose of chalk is to provide a quick and easy way to write and draw on surfaces such as blackboards, whiteboards, or even sidewalks. It is an excellent choice for temporary notes, lists and …