Of a rich green colour.
a variety of onyx or chalcedony.
A pyroxene mineral, a sodium aluminium silicate with the chemical formula Na(Al,Fe3+)Si2O6, found in metamorphic rocks.
A hard rubber made by vulcanization with sulfur; ebonite
An addition or annex to a group, set, or total.
A variety of translucent quartz, spangled throughout with scales of yellow mica.