Twilight Basalt is a dark grey to black basalt with Class 5 wear resistance (suitable for all commercial and domestic projects). Match your internal floor to your external flamed finished floor by using our sablino finish which is a sandblasted finish brushed over to a smooth surface. Unlike other basalts, Twilight Basalt contains lime and must be cleaned with an acid-free product such as our Detertwins cleaner. Fine pencil fissures can appear shortly after laying Twilight basalt. These veins are a normal natural occurrence.