Experienced miners train newer miners, and archaic language is passed along. In the s, elementary school students used a small piece of slate mounted in a wooden frame for writing practice and arithmetic problems. Writing was done with a small pencil made of slate, soapstone, or clay. The slate could be wiped clean with a soft cloth. Small slates were also used in schools and businesses to list daily events, schedules, menus, prices, and other notices.
Today, over years after writing slates started to disappear from schools, the word "slate" is still used in phrases such as "clean slate," "wipe the slate clean," "slated for today," "put it on the slate" and more. Slate siding: Slate is sometimes used as facing stone on building exteriors.
Foliation in slate is caused by the parallel orientation of platy minerals in the rock, such as microscopic grains of clay minerals and mica. These parallel mineral grain alignments give the rock an ability to break smoothly along planes of foliation. People exploit this property of slate to produce thin sheets of slate that are used in construction projects and manufacturing.
Slate tile flooring: Slate is a durable rock that is suitable for use as flooring, stair treads, sidewalk slabs, and patio stone. It is also produced in a variety of colors that allow it to be incorporated into a variety of design projects.
Shown above are multi-color flooring tiles. Most of the slate mined throughout the world is used to produce roofing slates. Slate is also used for interior flooring, exterior paving, dimension stone, and decorative aggregate. Small pieces of slate are also used to make turkey calls. Mica minerals such as biotite, chlorite, and muscovite, are the main components of slate. One unique characteristic of slate is that it is formed through the process of foliation, which refers to the repetitive lamination of metamorphic rocks caused by shearing forces or differential pressure.
Layers of rocks are then formed perpendicular to the direction of the pressure of metamorphic compression. This gives slate its ability to cleave along flat planes. It is considered as the finest grained foliated metamorphic rock, having 0.
The hardness of minerals is measured through the Mohs scale. This 1 to 10 scale has been widely used in mineral identification since The Mohs scale is a comparative tool, where it measures the hardness of a material by determining which other material can scratch it. For example, if stone A can scratch stone B, while stone B cannot scratch stone A, then A is a harder material and ranks higher on the scale. If they can scratch each other, then they are given the same rank and are considered to have the same hardness.
Slate is considered to be in between 2. However, the use of the term to refer to shale has resulted to confusion, as slate itself is actually different from shale. In s, a small piece of slate affixed in a wooden frame was widely used by elementary school students for their writing activities or arithmetic problems. People then used a small pencil made of slate, soapstone, or clay to write on the writing slate. It could be wiped clean with a cloth. The parallel alignment of minerals gives the rock the ability to break evenly along the planes of foliation.
This is called the slaty cleavage, which gives the rock the ability to split into very thin layers. There is approximately 0. Slate, therefore, can be produced in thin sheets that are mostly used in construction and manufacturing industries. What is Slate Used For? Slate can contain trace metals within the stone, and uneven heating in a microwave or oven may cause the slate to break You can pre-heat your Slate p late in a warming oven at F or less. Below are some fun uses you can try for your slate!
Slate is well known for its use as for serving food, but there are many other great uses for this unique natural stone, that makes it the perfect slate cheese board. The reason that slate is widely used for serving food is three-fold.
First, and most notable, is that the dark color of the natural stone brightens your cheeses and other foods making your dishes or offerings more vibrant and attractive. This is why slate is used in many fine restaurants as a serving plate. This makes it possible to split slate into thin sheets. Fine slate can also be used as a whetstone to hone knives. Due to its thermal stability and chemical inertness, slate has been used for laboratory bench tops and for billiard table tops.
In 18th and 19th century schools, slate was extensively used for blackboards and individual writing slates for which chalk pencils were used.
Because it is a good electrical insulator and fireproof, it was used to construct early 20th century electric switchboards and relay controls for large electric motors.
British sculptor Stephen Kettle is notable for his use of slate to create statues housed in the Science Museum in London. Slate tiles are often used for interior and exterior flooring or wall cladding.
Tiles are installed and set on mortar and grouted along the edges. Chemical sealants are often used on tiles to improve durability and appearance, increase stain resistance, reduce efflorescence, and increase or reduce surface smoothness.
Tiles are often sold gauged, meaning that the back surface is ground for ease of installation. Slate tiles were used in 19th century UK building construction apart from roofs. They can be set into the walls to provide a rudimentary damp-proof membrane. Small offcuts are used as shims to level floor joists. Slate is often used as a decor in freshwater aquariums. The geology of slate.
Slate is a metamorphic rock of sedimentary origin. It dates from the Ordovician period million years ago Is mainly composed of quartz, sericite and minerals of the chlorite group. Has been used as a construction material since the ancient Egyptians. Its colour depends on the mineral structure and size of the mineral grains that define its composition.
Uses of Slate. Slate is mainly used for: Roofing Cladding Flooring Decorative aggregate. What is the age of slate? Follow Us.
0コメント