It's Elemental: Aluminum - Basic physical and historical information. ChemicalElements.com: Aluminum - Basic information, atomic structure, and table of isotopes. USGS Minerals Information: Aluminum - Overview and a number of publications in PDF format. Aluminium versus Aluminum - The different American spelling of what British English spells 'aluminium' sometimes cause puzzlement as to how it could have come about. This article tells that story. Lenntech: Aluminum - Physical data, chemical properties, health and environmental effects. Wikipedia: Aluminum - Details the properties of the element, including its history, applications, and characteristics. WebElements: Aluminum - Extensive information on history, uses, occurrence, compounds, and properties of the element.