In addition to granite, basalt is the most commonly chosen natural stone, if a black, dark gray or anthracite-colored plaster is desired. The surface color of most basalts is uniform and inclusions are very rare. Basalt is most reminiscent of its volcanic origin.
Ornamental element patina
Naturally formed hexagonal basalt columns are split during the extraction of basalt. On their surfaces, a beige-brown or more often gray patina has often formed over millennia. These deposits on a part of the paving stones form light-colored surface stains, which visually resemble an irregular dust layer. The dark basic color gray to black is always dominant. A perfect uniformity without patina adhesions is achieved by polishing the brittle surface. The basalt develops a shine that conveys the metallic aspect of anthracite. A similar effect occurs after long wear by abrasion, which corresponds to a slow and steady polishing. The paving stones develop a smooth surface, which leads to slipping when wet. Therefore, basalt plaster is less suitable for laying on slopes.
Precise machining possible
Among all natural stones, basalt is one of the best paving stones to be worked on. The fracture surfaces can be set very precisely and basalt paving stones are sold in conical form by most suppliers. As a result, the paving stones cover the same area that they would reach in cubic cubic shape, but the weight per square meter of basalt decreases. This creates next to the large occurrence of basalt, another cost advantage, since natural stone is usually offered at the weight price. Granite paving stones start at prices of around 250 euros per ton, which corresponds to a surface area of three to eight square meters depending on the size of the single stone. Basalt paving stones are often combined with other natural stones and complement each other very well, for example, with the similarly expensive sandstone. Gabbro is not basalt.