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Chalk vs. Gypsum

Chalk and Gypsum Definitions

Chalk

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.

Gypsum

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

Chalk

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

Gypsum

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

Chalk

(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.

Gypsum

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.
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Chalk

A mark made with chalk.

Gypsum

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

Chalk

Chiefly British A score or tally.

Chalk

To mark, draw, or write with chalk
Chalked my name on the blackboard.

Chalk

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

Chalk

To make pale; whiten.
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Chalk

To treat (soil, for example) with chalk.

Chalk

(uncountable) A soft, white, powdery limestone (calcium carbonate, CaCO3).
Chalk cliffs are not recommended for climbing

Chalk

(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).
The chalk used to write on the blackboard makes a squeaky sound

Chalk

Tailor's chalk.

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).
When working out your next move, it's a good idea to get some more chalk from the bag

Chalk

A platoon-sized group of airborne soldiers.
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Chalk

The favorite in a sporting event.

Chalk

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

Chalk

To apply chalk to anything, such as the tip of a billiard cue.
Chalk your hands before climbing

Chalk

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

Chalk

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

Chalk

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

Chalk

To manure (land) with chalk.

Chalk

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

Chalk

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

Chalk

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.

Chalk

To rub or mark with chalk.

Chalk

To manure with chalk, as land.

Chalk

To make white, as with chalk; to make pale; to bleach.
Let a bleak paleness chalk the door.

Chalk

A soft whitish calcite

Chalk

A pure flat white with little reflectance

Chalk

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

Chalk

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

Chalk

Write, draw, or trace with chalk

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