A soft, pure, earthy, fine-textured, usually white to light gray or buff limestone of marine origin, consisting almost wholly (90-99%) of calcite.
A writing implement (made of white or coloured chalk) that leaves an impression through being divided into a powder or paste that sticks to the surface.
a piece of chalk (or similar substance) used for writing on blackboards or other surfaces
a pure flat white with little reflectance
a soft whitish calcite
write, draw, or trace with chalk
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 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
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
