Aluminum

Aluminum properties at a glance

Geology & background

Aluminum is refined mainly from bauxite ore and then cast, rolled, extruded, or machined into finished products.

Industrial aluminum became widely available after efficient electrolytic refining was developed in the late nineteenth century.

How to identify Aluminum

• Look for a lightweight silvery metal surface.
• Aluminum often appears matte or softly reflective rather than mirror-bright.
• Common forms include cans, foil, machined parts, cookware, and extruded frames.
• Oxidized aluminum stays pale gray rather than rusting orange-brown like iron.

Where Aluminum is found

Aluminum is manufactured, refined, recycled, or traded worldwide; verify grade, purity, and origin from markings, documentation, or provenance when available.

How much is Aluminum worth?

Value depends mostly on the object, purity or alloy grade, weight, brand, condition, markings, and whether it is jewelry, hardware, a coin, a tool, or a raw material sample.

Common uses

• Cans and foil
• Cookware
• Tools and hardware
• Frames and cases
• Aerospace and transportation

Interesting facts

• Aluminum is light for a metal and forms a thin oxide layer that helps protect the surface.
• Fresh aluminum is bright silver, but worn or oxidized aluminum can look matte gray.
• Aluminum is common in cans, foil, cookware, camera parts, tools, and hardware.

Care & safety

Aluminum can scratch, dent, tarnish, corrode, or lose its surface finish depending on the alloy, coating, and use wear.

Check sharp edges. Manufactured metal objects can have sharp edges, burrs, broken points, or worn plating; handle damaged pieces carefully.

Related rocks & minerals

Bauxite Minerals Corundum Minerals Cryolite Minerals Brass Metals & Alloys Bronze Metals & Alloys Chrome Metals & Alloys