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