Where does natural stone come from
Gneiss - the wrong granite
Gneiss - differentiation between orthogneiss and paragneiss
A distinction is made between 3 types of gneiss, whereby this differentiation is based on the parent rock.
• Orthogneiss: "Feldspar, quartz and mica, I will never forget the three ..." We can all remember this saying from geography lessons. This donkey bridge describes the composition of orthogneiss. Very often these have gone through several phases of transformation and emerged from already existing gneisses.
In their structure, orthogneiss can be both fine and coarse-grained.
• Paragneiss: In contrast to orthogneiss, this type of gneiss arises from the transformation of sedimentary rocks. Sandstone, greywacke, arkosen and clay slate can be found in the layers.
• In addition to orthogneiss and paragneiss, there is also migmatite: It is a kind of transition rock from metamorphic gneisses to igneous deep rock.
From a technical point of view, the three types mentioned can be distinguished minimally, they can be recognized in particular by their appearance. Orthogneiss and migmatite are usually colored, while paragneiss is usually gray.
Difference between gneiss and granite
As announced above, we now come to an important difference when it comes to rock types. The difference between gneiss and granite. Granite is also a deep rock, but it is of magmatic origin. This type of rock is created when molten rock solidifies and, over time, comes to the surface through the erosion of layers of rock above it. The following is relevant for use as a building material or as a design element in interior and exterior areas: Gneiss can absorb more water and have higher flexural tensile values, making them more robust than granite.
Gneiss - popular building material
Due to its nature, gneiss is often used to design indoor and outdoor areas. Due to its high density, the stone is very tough, abrasion-resistant and frost-resistant. Since gneiss has a particularly non-slip surface and therefore has an anti-slip property, the natural stone slabs are often used for terrace floors. Gneisses are also a real eye-catcher due to their color composition. The stone is also popular for walls. Walls made of gneiss are truly unique and are often used in garden design thanks to the wide range of design options.
Structure and surface
Due to the way gneiss is formed, the surface of the natural stone shows a wonderful marbling. Whereby the color differences can run linear as well as flat-slate. Due to its diverse appearance, gneiss is used for both elegant and rustic design elements. The surface of gneiss is originally rough. This property is particularly valued in the garden area and is therefore left there. This creates a rustic touch. For indoor use, the surface of the natural stone is often ground and polished. This gives the base plate a matt sheen.
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