Brazilian Black Riven Slate Hearth

Container-direct Brazilian black riven slate hearths, supplied by Bluesky Stone Direct from Milton Keynes and Colchester. Four stock sizes, two thicknesses, two grades — all from the same quarry, all held in stock.

Rectangles, done properly, this week. We cut rectangles, squares and the two-piece T-set. If your opening needs a circle, a teardrop or a one-piece T, we are not your supplier — and we would rather say so here than waste your time.

All slabs are calibrated to ±1mm with clean 90° machine-sawn edges. 30mm is made in 1200×900 and 1500×900 only. Every slab is a two-person lift and is delivered kerbside on a pallet.

20mm or 30mm is a look choice. 30mm has a thicker edge and a more substantial look, and is heavier to lift. Both thicknesses suit any hearth. As always, check with your installer in case there is a specific reason to choose differently.

• 14-Day Crack Guarantee. Fit it within 14 days of delivery. If it cracks in that time, we replace it free. Cut pieces included. Full crates are not covered.
• The credit card test. Every slab must let a standard credit card slide across the riven surface without catching on a ridge. A hearth that rocks under a stove is the fault nobody checks for.
• Container-direct pricing. Brazilian slate bought by the container, not through a UK middleman.
• Free pre-dispatch photo of your actual slab on every Premium order, and on any Standard order with a cutting or finishing service added.
• Free collection from our Milton Keynes workshop (MK8 8DD), booked at checkout, usually ready the next working day.

Both grades are the same stone, the same thickness and the same test results. The difference is how the slab is chosen.

• Standard Grade — the raw character of natural stone, with visible variation in texture, tone and pattern.
• Premium Grade — hand-sorted for even tone, so the face reads as one consistent colour.

Neither grade changes the edge finish: both come with clean 90° machine-sawn edges.

• Slip resistance: PTV 62 dry / PTV 49 wet — low slip risk
• Flexural strength: 19.6 MPa after 48 freeze-thaw cycles
• Water absorption: under 0.50% — high frost resistance
• Surface: subtle natural riven
• Edge: clean 90° machine-sawn as standard
• Colour: graphite grey to black in its raw state. Sealing takes it to a noticeably deeper, darker tone.
• Suitability: designed for the weight and radiant heat of a wood-burning or multi-fuel stove. Not for direct flame contact.

• Unsealed — included. Delivered in 3–5 working days.
• Deep Clean & Seal — £75. Deep-cleaned to remove quarry dust, then two coats of Stovax Dressing Oil. This is what takes the stone from grey to black. Allow one extra working day for the oil to dry.

Need a size we don't stock? Cut to Size cuts up to three matching pieces from one slab, from £163 including the slab. Standard 14 days or Priority 7 days.

• Collection from Milton Keynes (MK8 8DD) is booked at checkout, usually ready the next working day.
• Collection from Colchester (CO6 2JX) is arranged by phone. Call 01908 46 46 56 to confirm availability and any handling fee.
• Delivery to England and Wales is one charge per order, not per slab, shown beside the price above and confirmed at checkout.
• Scotland, Northern Ireland and the Islands — costs vary by postcode, so we quote individually. Call 01908 46 46 56 or email sales@blueskystone.com.
• Delivered kerbside by pallet via a nationwide carrier.

Full crates carry a lower per-slab rate and ship free to England and Wales. Crate quantities vary by size — 30 slabs for 900×600, 15 for 900×900 and 1200×900, 12 for 1500×900, 10 for 30mm. See the full-crate page for crate pricing, or open a trade account.

30 days from delivery on stock sizes, unused and in the original packaging, with no restocking fee. You arrange and pay the return pallet, which costs about the same as delivery. Cut-to-size pieces are made for you, so they cannot be returned.