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Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone
Onyx Black 10-20mm Black Basalt Decorative Stone

Onyx Black 10-20mm Black Basalt Decorative Stone

SKU: AG00002BG
Small Bag - 20kg
£23.99
Despatch within 2 weeks
Bulk Bag 750 - 800kg
£209.99
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Overview

Enhance your outdoor space with Onyx Black Chippings, a durable blend of basalt in mid-grey when dry and deep black when wet. Perfect for driveways, borders, patios, and decorative ground cover, they also help suppress weeds. Hardwearing and versatile, they suit any landscape design and being fish-friendly, they’re ideal for ponds and water features (wash before use).

As this is a natural product, please expect variations in size. See material details for more information. Please note: Bulk bag kerbside deliveries are available to mainland GB only via an 18-tonne artic tail lift vehicle. See how your order will arrive to ensure we can deliver to you.

Specifications

  • Colour: Black basalt
  • Material: Stone
  • Stone size: 10-20 mm
  • Stone shape: Angular
  • Approximate coverage (bulk bag): 8-10 m²
  • Depth of cover (bulk bag): 50 mm
  • Fish friendly: Yes (wash before use)
  • Manufacturer guarantee: 1 year

Material details

Sizing: Please note all our aggregates are quarried. The size of the product can vary and, in most cases, will be larger than expected. All sizes quoted are only an approximate indication.

Colour: Natural products may show some colour variations due to natural changes in rock formation, which are beyond our control. We take every measure to keep this to a minimum, but variations are to be expected. You will notice there is a colour variation on the images, this is to show the product wet and dry and in a different light.

Dust: All quarried decorative gravels will contain a certain amount of dust caused by blasting or digging at the quarries. The dust can be cleared by simply hosing the materials once laid or letting nature take its course by letting the dust wash away over time with rainfall.

How your order will arrive

Bulk bags will arrive via an 18-tonne truck that requires enough access to the area around the delivery point and space to manoeuvre safely. To avoid the disappointment of a failed delivery, ensure the off-loading area meets the requirements below:

  • Minimum width of 3 metres for vehicle access.
  • Free of any obstacles that may prevent delivery, such as low-hanging trees.
  • Reasonable level hard surface for off-loading. Pallets can weigh as much as 1 tonne.
  • Pallet pump trucks used for deliveries can not operate on soft or loose surfaces like grass or gravel.
  • All deliveries are kerbside and require a signature unless otherwise agreed and confirmed before delivery.
  • Delivery is only available to the mainland UK. There are extra charges for highlands and islands, so please contact us for a quote before placing your order.

Health and safety for you, the driver and the public, is at the driver's discretion to deem the delivery point unsuitable for offloading and within their rights to refuse to unload any consignments. Alternatively, the driver may suggest off-loading the consignment as near as possible to the required point where it is safe.

Failed Deliveries: Charges will be incurred if you have unsuitable access. If the delivery can not occur due to the delivery criteria, then a minimum of £95 + VAT per pallet return cost will be incurred.

Small bags will be shipped securely via our trusted courier partners, ensuring safe and timely delivery to your doorstep.

About Primrose

About Primrose

Primrose is the place to be to Discover Everything Garden.

We were created in 2003 to become the UK's largest online-only garden centre. Thousands of plants, planters, awnings, garden furniture sets, water features and more line our digital shelves, and we're ready to fill your garden with comfort, quality, colour and style.

If you'd like to find out more, check out our 'About Us' page.

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© 2026 Cercis Ltd. All rights reserved | Primrose is the trading name of Cercis Ltd (Registration number: 14521244)