Know all about Slate and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Nephelinite belongs to Igneous Rocks.Texture of Slate is Foliated whereas that of Nephelinite is Aphanitic. Slate appears Dull and Nephelinite appears Skeletal. The luster of Slate is dull while that of Nephelinite is vitreous to metallic. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Nephelinite is available in black, brown, colourless, green, grey, 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 Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).