Know all about Slate and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Slate and Gossan belong to Metamorphic Rocks.Texture of Slate is Foliated whereas that of Gossan is Rough, Sandy. Slate appears Dull and Gossan appears Dull and Banded. The luster of Slate is dull while that of Gossan is metallic. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses of Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates and that of Gossan are cemetery markers, commemorative tablets, gemstone.