(a soft whitish calcite)
(a pure flat white with little reflectance)
(an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant)
(a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces)
(write, draw, or trace with chalk)