Black River Stones are natural black river stones, made from natural basalt cobblestones through water washing, screening and polishing. With particle size 10–40mm, Mohs hardness ≥7 and water absorption ≤0.3%, they are pure black in color, round in surface, resistant to acid and alkali corrosion and free of radioactive pollution. Widely used in Chinese garden landscaping, courtyard water feature revetment and indoor decorative ornaments, creating a calm and magnificent visual effect, they are classic black decorative stones in landscape engineering.