Greenschist - also known as greenstone - is a general field petrologic term applied to metamorphic and/or altered mafic volcanic rock. The green is due to abundant green chlorite, actinolite and epidote minerals that dominate the rock. However, basalts...
Chlorastrolite is a green or bluish green stone, usually with finely radiated or stellate masses. Stellate masses tend to be chatoyant. It can be subtranslucent to opaque. It is a variety of pumpellyite: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O....
Greenstone (archaeology) - a type of stone, selected for color rather than composition, used by early cultures to create jewelry, ritual objects, statuettes, and other artefacts; used in particular in Mesoamerica studies.
