Know all about Foidolite and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Foidolite belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Foidolite is Earthy whereas that of Coal is Amorphous, Glassy. Foidolite appears Dull and Coal appears Veined or Pebbled. The luster of Foidolite is subvitreous to dull while that of Coal is dull to vitreous to submetallic. Foidolite is available in black, brown, colourless, green, grey, pink, white colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Foidolite are cemetery markers, commemorative tablets, creating artwork and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.