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Black Basalt Gravel 20mm
The larger size of this hard-wearing volcanic rock. It's colouration is dark grey with a slighty green look when dry but black and a darker green when wet.
From £4.32
To £106.92
Product Photo Key
This is a naturally occurring product and there can be variations in colour. We always photograph the product after washing because it can be dusty when you receive it.
Formed from the lava ejected by volcanoes. Is often known by different names like Charcoal Granite Gravel, Meteor Black Gravel or Ebony Black Gravel. This hard rock has two colour states. When dry the gravel is a mixture of charcoal grey with a hint of green but once wet it becomes black with a slight green tint. The 20mm is ideally suited for most uses but especially on driveways due to its size and hardeness and water features and ponds which bring out the colour. The size range is approximately 15-25mm. The recommended depth for laying is 40-50mm.
Depth for 20mm Graded Aggregates and Gravel
The recommended laying depth for this size is estimated to be between 40mm and 50mm.
More information and examples of other sizes and types of aggregates are available in our Aggregate Depth Laying Guide.
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