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.
ADVERTISEMENT
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.
ADVERTISEMENT
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.
ADVERTISEMENT
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