Know all about Siltstone and Novaculite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone and Novaculite belong to Sedimentary Rocks.Texture of Siltstone is Clastic whereas that of Novaculite is Banded, Glassy, Rough, Vitreous. Siltstone appears Rough and Novaculite appears Glassy or Pearly. The luster of Siltstone is dull while that of Novaculite is waxy and dull. Siltstone is available in brown, red, reddish brown colors whereas Novaculite is available in black, brown, green, grey, red, white colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Novaculite are cemetery markers, gemstone, in aquifers, in fire-starting tools, jewelry, manufacture of tools, pebbles are used in ball mills to grind in ceramics industry, to determine the gold content of jewelry.