Slate - Dense Fine-grained Layered Stone | Metamorphic Origin, Various Color Options

Slate:

Slate are dense and fine grained rock. The colors of slates are
generally gray, red, brown and green ranging from dark to light. It is
produced by the compression of clays, shale, and various other rocks
developing a characteristic cleavage consisting sericite and quartz
with biotite, chlorite, and hematite as principal accessories. In other
words slates are generally formed by low-grade regional metamorphism of
pelithic sediments or fine-grained tuffs. It can be associated with
other metamorphic sedimentary or volcanic rocks. Slates are or
argillaceous origin of metamorphic rocks and can also be defined as a
layered stone. Fossils may be sometimes preserved in slate but are
invariably distorted.