Presently, several regions in Vermont, New York, and Pennsylvania have active slate quarries. Brazilian slates, compared to the ones found in Spain, have higher water absorption indexes.
This property makes slate more prone to breakage when subjected to freezing, hence they are less used as a roofing material. Slateplate products are not microwave or oven safe. 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.
You can pre-cool your Slate p late in the freezer or refrigerator. As mentioned, slate is widely used as a roofing material. It is an efficient roofing material because it can be cut into very thin sheets. It also absorbs minimal water absorption index being 0. It is also favored for its resistance to moisture and good insulating capability.
Roofs made of slate can last for hundreds of years. However, slate is quite more expensive than other available roofing materials, and its installation cost more as well.
Hence, the use of slate in the more recent times has been mainly restricted to high-end projects and prestige architecture. Slate is also used for outdoor and indoor flooring, and cladding. Floorings of porches, basements, bathrooms, and kitchens, can be made of slate.
They are very durable, elegant-looking, and require less maintenance. Some slates that are used for indoor flooring have a wide variety of finishes, patterns, shapes, and colors. Landscaping also make use of slate rocks, taking advantage of its resistant property to weather and pollution.
Pavements, swimming pools, patios, and even contemporary fountains make use of slate either as a primary material or decorative stone. Slate can also be used as billiard table tops, commemorative tablets, and tombstones. Home Everything you need to know about Slate Everything you need to know about Slate.
Slate is considered as the finest grained foliated metamorphic rock. Metamorphic rocks are formed from the change in form of existing rocks, a process called metamorphism. Slate arises from the repetitive layering or foliation of metamorphic rocks, particularly through the low-grade metamorphism of shale or mudstone. It is widely used in building roofs and floors, for it being fireproof and a good electrical insulator.
As a result, in new construction slate is mainly confined to high-end projects and prestige architecture. Most slates are gray in color and range in a continuum of shades from light to dark gray. Slate also occurs in shades of green, red, black, purple, and brown. The color of slate is often determined by the amount and type of iron and organic material that are present in the rock.
The best way to learn about rocks is to have specimens available for testing and examination. The tectonic environment for producing slate is usually a former sedimentary basin that becomes involved in a convergent plate boundary.
Shales and mudstones in that basin are compressed by horizontal forces with minor heating. These forces and heat modify the clay minerals in the shale and mudstone. Foliation develops at right angles to the compressive forces of the convergent plate boundary to yield a vertical foliation that usually crosses the bedding planes that existed in the shale.
School slate: School slate used for writing practice and arithmetic. Students wrote on the slate with a "pencil" made from slate, soapstone , or clay. These slates were widely used until the late s, when wood-case pencils were easily produced and the price of paper became affordable. The word "slate" has not been used consistently over time and in some industries.
Today most geologists are careful not to use the word "slate" when talking about "shale. This confusion of terms partially arises from the fact that shale is progressively converted into slate. Imagine driving your car eastwards in Pennsylvania through areas of increasing metamorphism, starting where the rock is definitely "shale" and stopping to examine rock at each outcrop.
Thus it requires careful maintenance and should be treated as fine furniture. Marble is susceptible to damage from citric acids, alcohols and oils. Spills should be wiped up immediately. Treated properly, marble will remain elegant for decades. Limestone is formed as a result of millions of years of sea shells and bones of sea creatures settling as sediment on an ocean floor hence it is called a sedimentary stone.
It is available in elegant shades of yellow, blue, brown and black. Due to its durability and longlife, limestone is generally used as building stone and for making statues. Its use as wall cladding material has also gained immense popularity. Slate is metamorphic rock, like the marble. However, instead of forming from a pre-existing limestone like marble , slate is formed from the low-grade metamorphism of the sedimentary rock shale and volcanic ash deposited on sea floors.
Slate, like shale "mudstone" , is a very fined-grained rock of mostly microscopic clay minerals with some microscopic quartz and calcite.
The alteration of shale by heat and pressure produces the pronounced partings slaty cleavage that give slate its characteristics. Most slate mined today is used to produce roofing tiles. Slate is a good material for this purpose because it does not absorb water, survives freezing and thawing well, and can be cut into sheets. For the same reason, slate is used for flooring, decorations, and paving.
Historically, slate has been used to produce writing tablets, whetstones, laboratory bench tops, whetstones, cemetery markers, and billiard tables. Because slate is an excellent electrical insulator, it was used for early electrical switch boxes.
The Inuit used slate to make blades for ulus, a multi-purpose knife. The word "slate" has held different meanings over the years and in various industries. In the past, the terms "slate" and "shale" have been used interchangeably. In the modern usage, geologists say shale is converted into slate.
However, if you're looking at a partially metamorphosed rock, it's difficult to say whether it should be categorized as slate or as shale. One way to tell shale and slate apart is to strike it with a hammer.
Slate emits a "tink" or a ring when struck. Shale and mudstone produce a dull thud. A sheet of smooth stone used for writing might be referred to as a "slate," regardless of its composition. In addition to slate, writing boards have been made using soapstone or clay. American coal miners may refer to the shale forming the floor and ceiling of a mine as slate. Fragments of shale separated from coal during processing may also be called slate.
Although technically incorrect, the language is traditional.
0コメント