Alumina

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Alumina, uh LOO muh nuh, also called aluminum oxide, is a compound composed of aluminum and oxygen. Alumina occurs in nature as a mineral called corundum. Alumina and water occur in different combinations in the minerals boehmite, diaspore, and gibbsite. These minerals are found in bauxite, the chief source of the alumina from which manufacturers make aluminum.

Pyrite

Pyrite, PY ryt, or "fool's gold," as it is sometimes called, is a compound of iron and sulfur. Another name for it is iron pyrite. Pyrite is found… See more »

Calcite

Calcite is a mineral that occurs in small amounts in most types of rocks and makes up the largest part of limestone and marble. Pure calcite is… See more »

Pyroxene

Pyroxene, PY rok seen, is any of a group of minerals that play an important part in the formation of many kinds of rocks. Pyroxenes occur widely in… See more »

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Alumina

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