Know all about Picrite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Tachylite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Tachylite is Vitreous. Picrite appears Rough and Shiny and Tachylite appears Glassy. The luster of Picrite is subvitreous to dull while that of Tachylite is resinous. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Tachylite are cemetery markers, creating artwork.