greenstone

(countable, uncountable) Any of several green-hued minerals used for making various artefacts in early Mesoamerican cultures, e.g. greenschist, chlorastrolite, serpentine, omphacite, or chrysoprase.
(New-Zealand, countable, uncountable) 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).