Know all about Slate and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Icelandite belongs to Igneous Rocks.Texture of Slate is Foliated whereas that of Icelandite is Aphanitic to Porphyritic. Slate appears Dull and Icelandite appears Dull and Soft. The luster of Slate is dull while that of Icelandite is vitreous. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Icelandite is available in bluish - grey, grey, pink, yellow 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 Icelandite are cemetery markers, creating artwork.