a. A field term applied to any compact dark-green altered or metamorphosed
basic igneous rock (e.g., spilite, basalt, gabbro, diabase) that owes its
color to the presence of chlorite, actinolite, or epidote.
CF: greenschistb. See: nephritec. An informal name for a greenish gemstone, such as fuchsite or
d. Compact, igneous rocks that have developed enough chlorite in
alteration to give them a green cast. They are mostly diabases and
diorites. Greenstone is partially synonymous with trap. It is often used
as a prefix to other rock names. The term is used frequently when no
accurate determination is possible.
e. Includes rocks that have been metamorphosed or otherwise so altered
that they have assumed a distinctive greenish color owing to the presence
of one or more of the following minerals: chlorite, epidote, or
f. Freshly quarried stone containing quarry water. Arkell
g. Can. Generalized name given to Precambrian lavas. Hoffman