The industrial mineral sector was dominated by the production of limestone, marble, and sand and gravel. In 2003, the Philippines also produced bentonite, hydraulic cement, clays (including red and white), feldspar, lime, perlite, phosphate rock, pyrite and pyrrhotite (including cuprous), marine salt, silica sand, stone (including dolomite, volcanic cinder, tuff, quartz), and sulfur.