Hardness rates from 2.5 to 5 on the MOH Scale. A fine grained metamorphic stone that formed from clay, sedimentary rock shale, and sometimes quartz. Very thin and can break easily. Usually black, grey, or green. Identified by its marks which look like the skin of a serpent.
Most popular colors are green and brown.
Hardness rates from 2.5 to 4 on the MOH Scale. Does not always react well to recrystallization or diamond polishing. Underneath the Earths surface, liquid magma cooled and solidified. Mineral gases and liquids penetrated into the stone and created new crystalline formations with various colors. Usually has darker colors.