Know all about Siltstone and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Anorthosite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Anorthosite is Foliated, Glassy. Siltstone appears Rough and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Siltstone is dull while that of Anorthosite is pearly to subvitreous. Siltstone is available in brown, red, reddish brown colors whereas Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Anorthosite are creating artwork, curling.