slaty

"We are going into the sunlight, out of the shadow;" and she glanced back at the west, which was of a slaty blackness.

Red, somewhat slaty jasper, mixed with quartz and chalcedony, and containing specular iron ore.

Smoke-grey micaceous slaty-clay, much like certain beds of the old red sandstone, where it graduates into grey wacke.

A small miner's pick is useful for cutting out, and splitting portions of slaty rocks; or for obtaining specimens of clays, etc.

Slaty clay, with particles of mica, like that which frequently occurs immediately beneath beds of coal.