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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: