Greenstone is a name given to several different types of mineral.

• Greenstone is a form of green nephrite jade found in New Zealand and Australia.

• Greenstone belts are mixed sedimentary and volcanic rock sequences that often contain minable concentrations of gold, silver, copper, zinc and lead.

Greenstone as a geographic location.

• Greenstone is a town in Ontario, Canada.

Greenstone as the common name for a digital library software.

• Greenstone Digital Library is a popular open source digital library software developed at the University of Waikato, New Zealand -- New Zealand Digital Library Project http://www.greenstone.org/cgi-bin/library. The symbol associated with the software is a Maori tool with a greenstone (the jade).