Know all about Diatomite and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Diatomite belongs to Sedimentary Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Diatomite is Clastic or Non-Clastic whereas that of Pseudotachylite is Quench. Diatomite appears Soft and Pseudotachylite appears Dull and Soft. The luster of Diatomite is dull while that of Pseudotachylite is vitreous. Diatomite is available in grey, white, yellow colors whereas Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Diatomite are alumina refineries, animal feed filler, as a feed additive for livestock, creating artwork, drawing on blackboards, fire resistant, gymnasts, athletes and mountain climbers use for grip, in aquifers, soil conditioner, to ignite fire, used as a filter medium, used as an insecticide, whiting material in toothpaste, paint and paper and that of Pseudotachylite are creating artwork, gemstone.