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Webster 1913 Edition
Greenstone
Green′stoneˊ
(grēn′stōnˊ)
, Noun.
[So called from a tinge of green in the color.]
(Geol.)
A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc.
Webster 1828 Edition
Greenstone
GREE'NSTONE
,Noun.
A rock of the trap formation, consisting of hornblend and feldspar in the state of grains or small crystals.