metamorphic
Green Slate (or Phyllite / Chlorite Schist slab)
Metamorphosed argillaceous rock (chloritic slate)
AI-generated identification · may be incorrectHardness 2.5–4 on Mohs scale; dull to silky luster; distinct planar slaty cleavage; greyish-green to mottled red-brown coloration due to chlorite and iron oxides.
Identified More metamorphic →
Explore Green Slate (or Phyllite / Chlorite Schist slab) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 2.5–4 on Mohs scale; dull to silky luster; distinct planar slaty cleavage; greyish-green to mottled red-brown coloration due to chlorite and iron oxides.
Formation & geological history
Formed via low-grade regional metamorphism of shale or mudstone under directional tectonic pressure, predominantly dating from the Paleozoic or Precambrian eras.
Uses & applications
Commonly used in architectural roofing, floor tiling, decorative flagstones, and billiard table tops.
Geological facts
Slate naturally splits into ultra-thin, smooth sheets along microcrystalline mica and chlorite planes, a property prized for centuries in masonry.
Field identification & locations
Identified in the field by its fissility, dull ringing sound when struck, and greenish tint from chlorite minerals. Prominently found in Wales, Vermont, and Spain.
More like this
