Schists are regional metamorphic
They are formed in low to medium pressures and
They are foliated
rocks, with a
layered fabric which consists of thin planes that are easily broken
They often have a layering
light and dark minerals.
size is medium, with visible mineral crystals.
minerals are quartz,
some platy mica
minerals such as biotite
Other platy ones include graphite, talc and chlorite.
Minor minerals are kyanite, hornblende, actinolite and garnet.
vary between different types such as kyanite, garnet, green-, or
The mineral composition depends on the exact metamorphic
conditions in which it formed and the original rock from which it