Hematite (also spelled haematite) is iron oxide, Fe2O3. ... Unlike its oxide cousin magnetite, hematite does not attract a magnet. Hematite is common in ...

Petroleum (Crude Oil)—A black blob of natural seepage sits on a beach. Psilomelane—Manganese oxides make up this crusty mineral. ...

Magnetite is a common iron oxide mineral, Fe3O4, named for an ancient region of Greece where metal production was prominent. It is the only mineral that ...

Corundum is an aluminum oxide mineral, the natural form of alumina (Al2O3). It is extremely hard, second only to diamond, and is assigned hardness 9 in the ...

minerals · silicates · oxides · sulfides · carbonates. Formulas of Rock-Forming Minerals. Only a dozen minerals account for the vast volume of the world's ...

rutile · oxides · gemstones · crystals · quartz. Rutile (Rutilated Quartz). (c) 2006 Andrew Alden, licensed to About.com, Inc. (fair use policy) ...

gemstones · corundum · oxides · crystals · mohs hardness. Ruby (Corundum). ruby (c) 2005 Andrew Alden, licensed to About.com, Inc. (fair use policy) ...

Definition: A nonmetal oxide which reacts with water to form an acidic solution. Return to Glossary Index. Suggested Reading ...

Auto Repair Glossary OXIDES OF NITROGEN (NOx) ... OXIDES OF NITROGEN (NOx). Related Terms. • Carbon Monoxide • Hydrocarbon ...

Psilomelane (sigh-LOW-melane) is a catchall name for hard, black manganese oxides that form crusts like this in various geologic settings. ...