Moshe (not his real name, lest the wrong people read this) looks like any other religious Jewish man in Jerusalem â dark hair, dark beard, wire-rimmed glasses, poring over a Talmudic tome in a yeshiva.No one would suspect that he is the great-great-grandson of a former Shah of Iran.oshe (not his real name, lest the wrong people read this) looks like any other religious Jewish man in Jerusalem â dark hair, dark beard, wire-rimmed glasses, poring over a Talmudic tome in a yeshiva.
This article is about aluminium(III) oxide, Al 2 O 3. For other uses, see Aluminium oxide (compounds) . Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al 2 O 3. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.
The chief uses for alumina are for the production of aluminum metal and for abrasives, but it is also used for ceramics, refractories, pigments, catalyst carriers, and in chemicals. Aluminum oxide crystals are normally hexagonal, and are minute in size. For abrasives, the grain sizes are usually from 100 to 600 mesh.