Know all about Diabase and Coal properties here. All properties of rocks are important as they define the type of rock and its application. Diabase belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks.Texture of Diabase is Aphanitic, Granular whereas that of Coal is Amorphous, Glassy. Diabase appears Vesicular and Coal appears Veined or Pebbled. The luster of Diabase is not available while that of Coal is dull to vitreous to submetallic. Diabase is available in dark grey to black colors whereas Coal is available in black, brown, dark brown, grey, light to dark grey colors. The commercial uses of Diabase are an oil and gas reservoir, cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones and that of Coal are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry.