Know all about Slate and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Comendite belongs to Igneous Rocks.Texture of Slate is Foliated whereas that of Comendite is Porphyritic. Slate appears Dull and Comendite appears Foliated. The luster of Slate and Comendite is dull. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Comendite is available in blue, bluish - grey 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 Comendite are cemetery markers.