Black stone earns its place through density. It is a hard, tight basalt that resists abrasion, sheds water and holds a crisp arris, which is why it has always been the stone of choice for the parts of a building that take the most punishment.
Plinth courses, step treads, thresholds and kerbs all take concentrated wear and repeated wetting. Softer sandstones round off and stain at these points within a few seasons. Black stone does not. Its low porosity means water runs off rather than soaking in, so plinths stay clean and steps do not develop the dark tide line that plagues lighter stone.
Used sparingly against buff or cream stone, black banding gives an elevation structure and scale. A dark plinth visually anchors a building to the ground; a single black course at sill level reads as a horizon line and makes a tall wall feel settled. We generally advise using it as punctuation rather than as the field, large expanses of black stone absorb a great deal of heat.
We supply it honed for a soft matte surface, flamed where slip resistance matters on steps and around water, and polished where a deep reflective finish is wanted indoors. Flamed is almost always the right specification for anything walked on outdoors.
