Abrasive corundum is synthetically manufactured from bauxite. Accessory phases include titanite, apatite, corundum, zircon, magnetite and ilmenite. Red corundum stones also occur, and are called not sapphires but rubies. Other varieties of gem-quality corundum are called sapphires. Associated mineral phases include&colon; corundum, apatite, serpentine, and talc. The jewel material is usually synthetic sapphire or ruby (corundum). Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Rubies are corundum with a dominant red body color. Commodities such as black granite, corundum, and feldspar are also found. Pink colored corundum may be either classified as ruby or sapphire depending on locale. All other hues of the gem species corundum are called sapphire. Generally, gemstone-quality corundum in all shades of red, including pink, are called rubies. It is commonly associated with olivine, magnetite, serpentine, and corundum. Some are made entirely of faceted sapphire (corundum). Minerals that often display parting include the pyroxenes, hematite, magnetite, and corundum.