Know all about Slate and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Slate and Pseudotachylite belong to Metamorphic Rocks.Texture of Slate is Foliated whereas that of Pseudotachylite is Quench. Slate appears Dull and Pseudotachylite appears Dull and Soft. The luster of Slate is dull while that of Pseudotachylite is vitreous. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Pseudotachylite is available in black, brown, colourless, green, grey, pink, white 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 Pseudotachylite are creating artwork, gemstone.