noun
- A metamorphic rock formed from the alteration of shale or mudstone, characterized by a silky sheen and fine foliation.
Usage: geology; plural form of phyllite
Examples
- The mountainous region contains extensive deposits of phyllites interspersed with schist.
- Geologists identified phyllites in the core samples taken from the drill site.
- Phyllites are commonly found in areas of low-grade metamorphism.
- The phyllites in this formation show evidence of ancient tectonic activity.
- Mining operations in the region must account for the presence of phyllites when planning excavation.