20mm Charcoal Basalt

20mm Charcoal Basalt is a durable, angular gravel that appears dark grey when dry and turns a deep black when wet. The hard igneous stone resists wear, compacts well and offers a neat, modern finish. Its angular texture provides good traction underfoot, while the consistent 20mm grade makes it ideal for driveways, paths and decorative borders. Low maintenance and fish friendly, it can also be used around water features for strong visual contrast.