greenstone

Short definition from Wiktionary

Noun

1. 1
   Any of several green-hued minerals used for making various artefacts in early Mesoamerican cultures, e.g. greenschist, chlorastrolite, serpentine, omphacite, or chrysoprase.
2. 2
   The pounamu, the green-hued minerals of New Zealand used by the Māori to make tools, ornaments and weapons (any of three varieties of nephrite jade or one variety of bowenite).

Proper noun

1. 1
   A surname.
2. 2
   A municipality in Thunder Bay District, Ontario, Canada.