GREENSTONE
Proper noun
Greenstone
A surname.
Etymology
Noun
greenstone (countable and uncountable, plural greenstones)
(archaeology) 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) pounamu, the green-hued minerals of New Zealand used by MÄori to make tools, ornaments and weapons (any of three varieties of nephrite jade or one variety of bowenite)
Source: Wiktionary
Green"stone` (gren"ston`), n. Etym: [So called from a tinge of green
in the color.] (Geol.)
Definition: A name formerly applied rather loosely to certain dark-colored
igneous rocks, including diorite, diabase, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition