An abrasive paper used in the finishing of jewellery items prior to final polishing. The term emery is usually applied to a description of scrap material returned to the bullion dealer for refining i.e., the used sheets of emery paper which will contain precious metal deposits after use.
A natural abrasive that contains aluminum oxide and small amounts of iron oxide and is noted for its red color. Once used extensively by industry, it is used today only in coated abrasives for home workshops. Consistency a low hardness of the mineral limits it usefulness in industrial applications.
A naturally-occurring abrasive containing aluminum oxide and iron oxide used in light applications rather than industrial processes because of its low hardness.
The abrasive used for grinding a lens surface.
Abrasive material composed of iron oxide and carborundum.
a hard, dark granular rock consisting of corundum with various iron minerals. [AHDOS
Emery is a very hard rock type used to make abrasive powder. It largely consists of the mineral corundum (aluminum oxide), mixed with other species such as the iron-bearing spinels hercynite and magnetite, and also rutile (titania). Industrial emery may contain a variety of other minerals and synthetic compounds such as magnesia, mullite, and silica.