Silica gel is a porous solid material made by treating sodium silicate with sulfuric acid. It is used as a dehumidifier or a dessicant. Aluminosilicate minerals or zeolite , which exhibit ion-exchange properties are used for water softening. Silicon carbide, SiC or carborundum, which is a tough, abrasive substance that is used for grinding metals. Portland cement , which is a complex mixture of calcium silicates and aluminosilicates.
Silicones are polymeric synthetic silcon compounds.
Silicones are used as lubricants and water repellents and in waxes and varnishes. Silicone rubbers are superior to natural rubbers in their resistance to both high and low temperatures and chemicals.