|Slate is usually dark, but it can be colorful
too. Slates vary in color and are most
common in black, gray, red, purple, or
green. The red color is due to the presence
of Hematite, while green colors are due to
Chlorite. Grey and black are caused by
carbon and/or graphite in the slate. iron
oxides are responsible for red, purple, and
tan shades. High-quality slate has been used
as roofing tiles, paving stone, pool tables,
and blackboards. Some of the slate rooftops
from 16th century Europe are still in use
today which hints at its great durability.
|All of the slate used at Slate
Products, LLC is diamond
drilled using an in-house
developed method which
assures precision cut pieces and
extremely accurate fits.
|(We could tell you how its done but then our
stonecutter would have to kill you! ;)
|Slate develops geologically from the
sedimentary rock, shale.
Occasionally basalt or other
fine-grained rock can metamorphose
into slate. When shale is buried
deep underground its clay minerals
neomorphose into chlorite and
muscovite mica crystals. When these
crystals fuse together they form a
denser and harder rock along its
lateral edge resulting in a material
cleavage. This allows it to be split
along one plane rather easily but
makes it strong in the other plane.
Slate is a metamorphic rock which is
formed under relatively low pressure
and temperature conditions.
|An abandoned slate quarry in the Huron
Mountains of Baraga County