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