Chalk vs. Gypsum

A soft compact calcite, CaCO3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellow-white and derived chiefly from fossil seashells.

A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.

A piece of chalk or chalklike substance in crayon form, used for marking on a blackboard or other surface.

A mineral consisting of hydrated calcium sulphate. When calcinated, it forms plaster of Paris.

(Games) A small cube of chalk used in rubbing the tip of a billiard or pool cue to increase its friction with the cue ball.

A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

A mark made with chalk.

A common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)

Chiefly British A score or tally.

To mark, draw, or write with chalk

To rub or cover with chalk, as the tip of a billiard cue.

To make pale; whiten.

To treat (soil, for example) with chalk.

(uncountable) A soft, white, powdery limestone (calcium carbonate, CaCO3).

(countable) A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO4), that is used for drawing and for writing on a blackboard (chalkboard).

Tailor's chalk.

A white powdery substance used to prevent hands slipping from holds when climbing, or losing grip in weight-lifting or gymnastics, sometimes but not always limestone-chalk, often magnesium carbonate (MgCO3).

A platoon-sized group of airborne soldiers.

The favorite in a sporting event.

The prediction that there will be no upsets, and the favored competitor will win.

To apply chalk to anything, such as the tip of a billiard cue.

To record something, as on a blackboard, using chalk.

To use powdered chalk to mark the lines on a playing field.

(figuratively) To record a score or event, as if on a chalkboard.

To manure (land) with chalk.

To make white, as if with chalk; to make pale; to bleach.

A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.

Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon.

To rub or mark with chalk.

To manure with chalk, as land.

To make white, as with chalk; to make pale; to bleach.

A soft whitish calcite

A pure flat white with little reflectance

Amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant

A piece of chalk (or similar substance) used for writing on blackboards or other surfaces

Write, draw, or trace with chalk