Greenstone

Greenstone is a name given to several different types of minerals and rocks.

• Pounamu, a form of green nephrite jade found in the South Island of New Zealand
• Chlorastrolite, found in the Keewenaw Peninsula of Michigan and Isle Royale in the US
• Elvan, a quartz-porphyry found in Cornwall, UK
• Greensand, glauconite bearing sandstone and a geologic formation in the UK
• Greenschist, metamorphosed mafic volcanic rock and a metamorphic facies
• Greenstone (archaeology), a type of stone used by early cultures, particularly in Mesoamerica
• Greenstone belt, Archean and Proterozoic volcanic–sedimentary rock sequences

Greenstone may also be:

• Greenstone, Ontario, a municipality in Canada
• Greenstone (software), an open source digital library software package
• The Greenstone Building, a Canadian federal government office building in Yellowknife
• Greenstone River, river in the Otago/Southland region, New Zealand
• Greenstone, LLC, the generics division of Pfizer