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  • Siltstone - characteristics, properties, origin and application

    1. What is the origin
    2. What is characteristic of them?
    3. What are the properties of this mineral?
    4. Scope of application
    5. What are the disadvantages of stone?

    Finishing a variety of buildings with spectacular natural stones never goes out of style Finishing a variety of buildings with spectacular natural stones never goes out of style. One of the minerals used for these purposes, half-rock siltstone, is extremely interesting. For builders and architects, the beauty and practical properties of this beautiful durable stone have been known for a long time. Proof of this are siltstone plates adorning the most beautiful, world-famous buildings of St. Petersburg. For example, St. Isaac's Cathedral.

    Coal miners, often encountering silt in coal mining, characterize this peculiar mineral as an intermediate link between clays and sandstones. Its ancient Greek name speaks of "powdery stone" or "petrified flour."

    What is the origin

    Its formation begins with silty sediments mixed with clay dust and fine grains of sand Its formation begins with silty sediments mixed with clay dust and fine grains of sand. Under the mass of layering of new sludge, the bulk material is caked, converted into a fairly solid intermediate material - siltstone. Millions of years are required for its accumulation and compaction. The deeper the silt sinks into the bowels, the greater it is affected by rising temperatures and increasing pressure. This increasing effect completes the transformation of the granular mixture into a stronger, more resistant to different influences material. Siltstones and siltstones often, but not always, are adjacent to coal seams. Often, they are adjacent to other clay deposits that have appeared by sedimentary path.

    What is characteristic of them?

    Despite the resemblance to sandstone, siltstones are noticeably denser, in most they are painted brighter and denser Despite the resemblance to sandstone, siltstones are noticeably denser, in most they are painted brighter and denser. Their use is somewhat different than that of sufficiently loose sandstones going to the construction of warm walls.

    In construction, in finishing works they are appreciated for their external qualities and strength. Fine-grained chips in a peculiar way refract light. The most valuable are the samples casting a bluish-purple shine. Some particularly valuable samples in electric light give a tint of the shade of the sea wave. The most spectacular siltstones of red and violet shades are mined in a few deposits. One of them is located in Karelia. Here it is also called "siltwood."

    Dark-colored or light-gray siltstones are much more common Dark-colored or light-gray siltstones are much more common. Brownish, greenish, yellowish and brown samples are found. The surface texture is like a beautiful ripple on the water.

    Most of the sparkling particles, which in these stones can be 30-75%, are represented by quartz and feldspar. Less common is mica and other minerals. They are fastened together by clay or clay-calcareous rocks. The glandular impurities present in some of them are responsible for brownish, reddish and yellowish hues.

    What are the properties of this mineral?

    • They have excellent frost resistance. Do not crack upon sudden changes in temperature.
    • No dangerous radioactivity. All samples, before entering construction sites and becoming a luxurious finish, undergo a radiation-hygienic assessment. It is carried out by specialists from metrological centers and the Institute of Geology.
    • The density, measured in g / cm3, ranges from 1.8-2.8.
    • Mohs hardness within 6 points, determined by the fact that siltstones are able to scratch the glass.
    • The difference in the indicators of water absorption of siltstones having different origin and composition is 0.2-0.45%. Only varieties that are not washed out by water are suitable for use.

    Scope of application

    • The dust necessary for the construction of roads is siltstone crumb, not bearing aesthetic value.
    • Siltstone dust, which is a waste of the production of stone tiles of various thicknesses, is used in the production of certain types of bricks and grades of cement.
    • Occasionally, the most beautiful designs are used to decorate rooms. For example, decoration of fireplaces. Combinations of various shades of siltstone in the interior, the combination of thin plates of this material with wooden details on one of the walls, look advantageous. This allows you to set a specific style for the entire design of the house. For example, a fashionable loft or ethnic.
    • Talismans, figurines and souvenir balls are made from a rock considered to be ornamental stone, designed to harmonize family relationships and improve the well-being of their owners.
    • Occasionally, it can be seen in exclusive jewelry. In mineralogical collections you can find the rarest and most expensive samples.

    What are the disadvantages of stone?

    • The relatively high cost of the most high-quality and spectacular varieties. The price can vary significantly from more than 1000 rubles for a rare collection cabochon to 300 rubles per square meter of mineral that has not been processed. Depends on the properties and qualities, the degree of processing, plate thickness and other parameters.
    • Low moisture resistance. Samples that are “washed away” by water do not get on sale. But, when choosing, the parameters of water absorption are immediately clarified. Depending on the purpose for which specific stone slabs are intended, it may vary slightly. Slabs made to decorate the walls inside the house can be slightly less waterproof than those that will cover the facade or walkway in front of the house.

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