Know all about Shale and Foidolite properties here. All properties of rocks are important as they define the type of rock and its application. Shale belongs to Sedimentary Rocks while Foidolite belongs to Igneous Rocks.Texture of Shale is Clastic, Splintery whereas that of Foidolite is Earthy. Shale appears Muddy and Foidolite appears Dull. The luster of Shale is dull while that of Foidolite is subvitreous to dull. Shale is available in black, brown, buff, green, grey, red, yellow colors whereas Foidolite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Shale are creating artwork, pottery and that of Foidolite are cemetery markers, commemorative tablets, creating artwork.