Gneiss is one of the larger and major groups of metamorphic rock. The mineralogical composition of this rock includes always feldspar and quartz, which are usually accompanied by mica and less by amphibole. Depending on the ingredients (dominant or rare), gneisses are given special names such as oligoclase gneiss, biotite gneiss, hornblende gneiss. Gneiss rocks in Poland are present in the Sudetes, Jizera Mountains, Owl Mountains, Śnieżnik Mountains and in the Western Tatras.
Applications: Gneiss as aggregate is used extensively in the construction of roads and railways. Gneiss mixes and crushed stone are a perfectly compacting material successfully used in substructures of main and auxiliary major thoroughfares with high traffic intensity. Aggregates produced in our mine are used for the construction of motorways and expressways (A4 and A1 in the Silesian Province) as well as in garden design. Gneisses look amazing in alpine gardens and water gardens. They can be used successfully in the construction of squares, pavements and cycling trails. Grit as broken aggregate used for the construction of roads (asphalt concrete, bitumen-aggregate mixtures) for wearing courses, binding and equalizing layers and in construction (production of concrete up to B50).
Thanks to its characteristic structure and texture (the slightly shiny grey colour with pretty layered structure) Gnejs is widely used in garden design. They look amazing in alpine and water gardens. Gneiss can be obtained in the form of natural stone slabs to pave terraces and paths. You can also build impressive water cascades and natural stairs in a rock garden.