G5269200 (grēn′shĭst′)n. A greenish schist that forms under conditions of low temperature and low pressure and often contains the mineral chlorite, epidote, or actinolite.
greenschist
greenschist
[′grēn‚shist] (petrology) A schistose metamorphic rock with abundant chlorite, epidote, or actinolite present, giving it a green color.