Know all about Picrite and Hyaloclastite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Hyaloclastite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Hyaloclastite is Pyroclastic. Picrite appears Rough and Shiny and Hyaloclastite appears Dull. The luster of Picrite is subvitreous to dull while that of Hyaloclastite is dull and grainy. Picrite and Hyaloclastite are available in black, brown, colourless, green, grey, pink, white, yellow 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 Hyaloclastite are cemetery markers, creating artwork.