An abrasive is a usually very hard material that is used to smooth or to machine another through extensive rubbing. Some common examples of abrasive objects are:

• Borazon
• Carborundum
• Coated abrasives
• Cubic Boron Nitride (CBN)
• Diamond dust
• Emery (mineral) (impure corundum)
• Grinding wheel
• Powdered glass
• Pumice dust
• Sand
• Sandpaper