Description Charcoal Granite Gravel 20mm is a stylishly smoky grey volcanic aggregate that darkens beautifully to a deep, jet-black colour when wet. It is extremely durable and resistant to moss growth making it the perfect decorative material for dressing garden paths and general decorative landscaping. Also known as Black Basalt or Black Granite, this aggregate is mostly angular in shape meaning it interlocks naturally and stays in place when walked or driven on.
