adjective
also slat·ey ˈslād.]ē, -āt], ]i\
Etymology: slate (I) + -y
1. : of the nature or composition of, containing, or characteristic of slate
a slaty texture
a slaty cleavage
especially : of a grayish cast suggestive of slate
the slaty sky of dawn — Ethel Wilson
house had a slaty impoverished look — Viola Meynell
2. : having mineral grains that are extremely small — used of rock foliation
those with a slaty foliation have a very smooth cleaved surface — D.O.Woolf