Slaty

[Sarah]

Resembling slate; having the nature, appearance, or properties,of slate; composed of thin parallel plates, capable of beingseparated by splitting; as, a slaty color or texture. Slaty cleavage(Min.), cleavage, as of rocks, into thin leaves or plates, like thoseof slate; -- applied especially to those cases in which the planes ofcleavage are not parallel to the planes of stratification. It is nowbelieved to be caused by the compression which the strata haveundergone.-- Slaty gneiss (Min.), a variety of gneiss in which the scales ofmica or crystals of hornblende, which are usually minute, form thinlaminæ, rendering the rock easily cleavable.

[Sarah]

The result of mis-typing salty, but can be used anyways.