Basalt is a fine-grained volcanic igneous rock formed by the rapid cooling of lava at the Earth's surface. One of the most widespread rocks in the Earth's crust, it is characterised by high hardness and excellent resistance to abrasion, weathering, heat, and frost. Basalt delivers high mechanical strength and a long operational service life across every application in which it is used. Considered among the best natural stones for engineering and construction use thanks to its outstanding durability, its demand is growing strongly in infrastructure projects and in basalt fibre production as a lightweight, high-performance alternative to glass fibre.