Schist
Videos
Schist is a medium-grained metamorphic rock generally derived from fine-grained sedimentary rock, like shale. It shows pronounced schistosity. This means that the rock is composed of mineral grains ea
A schist showing characteristic scaly schistose texture caused by platy micas
Microscopic view of garnet-mica-schist in thin section under polarized light with a large garnet crystal (black) in a matrix of quartz and feldspar (white and gray grains) and parallel strands of mica (red, purple and brown).
View of cut garnet-mica-schist
Manhattan schist from southeastern New York State
Foliation (geology)
Videos
Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer can be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin word folium, meaning
Gneiss, a foliated metamorphic rock.
Quartzite, a non-foliated metamorphic rock.