Know all about Marl and Alkali Feldspar Granite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Alkali Feldspar Granite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Alkali Feldspar Granite is Phaneritic. Marl appears Rough and Dull and Alkali Feldspar Granite appears Veined or Pebbled. The luster of Marl is dull while that of Alkali Feldspar Granite is dull to grainy with sporadic parts pearly and vitreous. Marl is available in beige, brown, green, grey, white colors whereas Alkali Feldspar Granite is available in black, grey, orange, pink, white colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Alkali Feldspar Granite are curling, gemstone, laboratory bench tops, tombstones.