Explains the structure and properties of this form of common table salt, sodium chloride. Includes images of the mineral as it occurs in nature.

Defines the chemical composition and locations for this form of common salt.

Identifies the composition, key properties, and geographic locations of this form of iron oxide. Includes several photos.

Defines a common form of iron found in soil all parts of the world.

Read a fact sheet on hemimorphite, one of the more common sorosilicates. Includes photos of specimens and a list of uses.

Learn about this blend of iron, aluminum, and sodium commonly found in the US and northern Europe.

Study the physical characteristics of hornblende, including the best field indicators. Features photos and chemical composition information.

Learn about the Russian origins of this common component of titanium dioxide. Used to manufacture white pigments.

Offers an introduction to the two forms of this esteemed stone, jadeite and nephrite. Discusses their composition and distribution.

Offers the chemical composition, colors, and physical qualities of this highly valued gem.

Covers the stripped, banded, and mottled varieties of this gemstone found in Siberia and Egypt.

Defines a black gemstone used in costume jewelry. Includes physical qualities.