Know all about Rapakivi Granite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Rapakivi Granite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Rapakivi Granite is Granular, Phaneritic whereas that of Siltstone is Clastic. Rapakivi Granite appears Veined or Pebbled and Siltstone appears Rough. The luster of Rapakivi Granite is dull to grainy with sporadic parts pearly and vitreous while that of Siltstone is dull. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Rapakivi Granite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.