greenstone

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green·stone

 (grēn′stōn′)
n.
Any of various altered basic igneous rocks colored green by chlorite, hornblende, or epidote.

greenstone

(ˈɡriːnˌstəʊn)
n
1. (Geological Science) any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
2. (Minerals) a variety of jade used in New Zealand for ornaments and tools

green•stone

(ˈgrinˌstoʊn)

n.
any of various altered basaltic rocks having a dark green color.
[1765–75]