Know all about Icelandite and Alkali Feldspar Granite properties here. All properties of rocks are important as they define the type of rock and its application. Icelandite and Alkali Feldspar Granite belong to Igneous Rocks.Texture of Icelandite is Aphanitic to Porphyritic whereas that of Alkali Feldspar Granite is Phaneritic. Icelandite appears Dull and Soft and Alkali Feldspar Granite appears Veined or Pebbled. The luster of Icelandite is vitreous while that of Alkali Feldspar Granite is dull to grainy with sporadic parts pearly and vitreous. Icelandite is available in bluish - grey, grey, pink, yellow colors whereas Alkali Feldspar Granite is available in black, grey, orange, pink, white colors. The commercial uses of Icelandite are cemetery markers, creating artwork and that of Alkali Feldspar Granite are curling, gemstone, laboratory bench tops, tombstones.