a purplish black colour.

(nautical) a slate on which the courses steered by a ship (and distances run) were recorded, but have been wiped clean after being entered in the log at the end of a watch / (by extension) a fresh start

(geology) A slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained.

An argillaceous rock that splits readily into thin sheets.

(nautical) A double slate, marked and ruled on the inside, for recording the log.

(mineralogy) A variety of slate used for sharpening cutting instruments; novaculite; oilstone.

A soft, slaty substance used in crayon drawing.

Used other than figuratively or idiomatically: see blank, slate. / (figuratively) Something that is clear and empty, or free from preconceptions and biases.

A mineral used for polishing glass, marble, and metals, composed chiefly of silica, with a little alumina, lime, iron oxide, and water.

plural of slate gray