Brazilian Black Riven Slate Hearth T-Shape Set | 1200×380 + 900×450 | 20mm

Brazilian Black Riven Slate Hearth T-Shape Set | 1200×380 + 900×450 | 20mm

★ 4.81 · 468 reviews | In stock
Crack Guarantee
If your slab cracks within 7 days of installation (installed within 14 days of delivery), we replace it — no quibble, no charge.
Free Photo Service
Premium orders always include a photo of your exact slab before dispatch. Standard orders include it when a cutting or finishing service is added.
Guaranteed Level Surface
Guaranteed flat riven texture — a standard credit card slides smoothly across without catching.
STEP 1 · CHOOSE PURCHASE TYPE

➡️ Free Nationwide Logistics: Full-crate orders ship directly from our Colchester Distribution Centre, with free delivery across England and Wales. ➡️ Trade Account Registration takes 2 mins. Unlock discounts across our entire range. WhatsApp ordering, Dedicated Trade Account Manager and more.

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STEP 2 · ADD A SERVICE (OPTIONAL)
No cutting or finishing — the slab exactly as supplied.

Workshop services are available for single slab purchases only. For bulk crate processing, please contact our trade desk.

Quantity
Base Slab Price: £150.00 inc. VAT
£150.00 inc. VAT
£150.00

Key Specifications

  • Dimensions: 1200×380 + 900×450, 20mm
  • Material: Brazilian Black Riven Slate
  • Primary use: Wood-burning stove hearths
  • Guarantee: 7-Day Crack Guarantee
  • Photo service: Free photo of your exact slab before dispatch
Overview

Supplied by Bluesky Stone, based in Milton Keynes, specialising in Brazilian slate and limestone hearths available in standard stock sizes or custom-cut for trade and residential installations across England and Wales.

Direct-from-quarry Brazilian Black Natural Riven Slate (1200 x 380 x 20 mm + 900 x 450 x 20mm). Engineered with a calibrated 20mm thickness, a flat, subtle riven surface, and clean 90° machine-sawn edges. Part of our full Natural Riven Slate Hearths range and our Slate Hearths range.

This set features a book-matched design—cut sequentially from a single slab—ensuring the natural grain flows seamlessly across both sections, ensuring perfect aesthetic harmony when installed.

Highlights & Key Features

  • Direct-from-Quarry Pricing: Brazilian slate sourced container-direct to avoid retail markups.
  • Free Delivery: Available on all full crate orders to England and Wales.
  • 14-Day Crack Guarantee: If your slab cracks within 14 days of delivery (provided it is installed within that same 14-day window), we'll replace it at no extra cost.
  • Free Pre-Dispatch Photo Service: Every premium-grade order includes a free dispatch photo of your exact slab sent straight to you before delivery. Standard-grade slabs also include this service whenever a custom cutting or finishing service is added.
  • Guaranteed Level Surface: A standard credit card slides smoothly across without catching on sharp ridges on the surface.
  • Order a Sample: Choose up to 2 free samples for a flat £5 delivery fee. See the texture and quality in person before committing to a full slab. Order your sample

Design Details: The 1200 x 380 x 20mm front hearth section features expertly dressed, outward-facing edges with a subtle chamfered edge profile and matte-polished sides for a clean, contemporary look. The rear chamber section is precision machine-sawn on all four sides, ensuring a tight, flush fit against surrounding brickwork or walls.

Product Overview & Suitability

Yes, this 20mm slate hearth is designed for heavy or wood-burning stoves and fireplaces.

  • Heat Resistance: These calibrated slabs are engineered to withstand the weight and heat of a log burner. Not suitable for direct flame.
  • Dimensions: 1200 x 380 x 20 mm + 900 x 450 x 20mm (+/- 1mm)
  • Book-Matched: Yes — both sections have been cut from the same slab to ensure a consistent visual appearance and uniformity across both sections.
  • Weight: 48 kg per slab (1-2-person lift)
  • Surface Finish: Subtle Natural Riven surface
  • Edge Finish: Front section dressed sides and edges / rear section sides all sawn
  • Colour Profile: Raw state Graphite grey / Black with natural variation in colour and tone. After sealing, expect a much deeper and darker tone.
  • Applications: Ideal for living rooms and dining rooms
Technical Specifications (Lab Results)

This slate has been rigorously tested to ensure it meets the highest safety and durability standards:

  • Slip Resistance: PTV 62 (Dry) / PTV 49 (Wet) – Rated as Low Slip Risk
  • Flexural Strength: 19.6 MPa (48 Freeze-Thaw Cycles)
  • Water Absorption: Less than 0.50% (High Frost Resistance)
Natural Riven Grading: Standard vs. Premium

We offer two distinct grades for this natural stone. Both share identical structural integrity and test results, but differ in visual selection:

  • Standard Grade: Celebrates the raw character of natural stone with visible variations in texture, tone, and pattern.
  • Premium Grade: Hand-selected for aesthetic harmony; manually sorted to ensure a homogeneous appearance with a consistent colour tone across the surface.

Guaranteed Level Surface — The Credit Card Test:

Regardless of grade, every slab must pass our internal surface tolerance test: a standard credit card must slide smoothly across the riven surface without catching or snagging on sharp ridges.

Bespoke Cutting & Fabrication Services

Tailored stone solutions for a perfect hearth installation.

Our in-house fabrication team based in Milton Keynes provides professional tailoring for our entire range of Brazilian Slate and Limestone slabs. We offer three service tiers:

1. Professional Laser-Guided Cutting: We provide precise laser-guided straight-line cutting to match your dimensions.

  • Shapes: Squares, rectangles, and pentagons.
  • T-Shape: We can supply 2pc T-Shape solutions—significantly easier to handle and reducing the risk of the stone cracking during transit and installation.

2. Deep Clean & Seal Service: Bring out the true character and depth of your natural stone.

  • Process: Each slab is deep-cleaned and washed to remove quarry dust and reveal its natural riven character.
  • The Finish: We apply two coats of Stovax Dressing Oil. For Brazilian Slate, this transforms the raw graphite-grey profile into a deeper, darker, and more luxurious tone.

3. The "Signature Bundle" Package (Best Value): Our most popular choice for a professional, high-end fireplace finish. This package includes everything in the cutting and sealing services, plus:

  • Dressed Edges: We manually ease the edges and hone the sides of your stone (a process we call "dressing").
  • The Look: This creates a smooth, chamfered edge that offers a truly wonderful, high-quality aesthetic for modern and traditional homes, representing exceptional value with edge-dressing included at no additional cost.
Local Service & Trade Support
  • Local to Milton Keynes? Enjoy free Click & Collect to waive delivery fees entirely.
  • Trade-Ready Service: Available for local installers who require precision-cut material on short lead times. Contact our team for details.
  • Free Samples: Collect samples at no cost from our warehouse to check colour and texture.
Ordering & Delivery
  • Free Delivery: Applies to all full crates and covers all areas of England and Wales.
  • Single Slabs: If you're in England or Wales, your delivery cost shows automatically at checkout—no quote needed. Delivering to Scotland, Northern Ireland, or the Islands? Delivery costs vary by location, so we provide a free personalised quote instead.
  • Nationwide Logistics: Direct-to-site delivery via 3rd-party nationwide pallet delivery. Offloaded by pallet and delivered kerbside.
  • Customer Quotes: Call 01908 46 46 56 or email drawings to sales@blueskystone.com.
Frequently Asked Questions
How is this slab delivered?
At 1500x900mm this is our largest slab and ships on an oversized pallet. Single slab delivery to England and Wales is £130 inc. VAT. Full crates (12 slabs) are delivered free of charge. Scotland, Northern Ireland, and islands — please request a quote at checkout.
Does the slab come sealed?
No — supplied in its natural state. We recommend applying a stone oil or colour-enhancing sealer before installation. Our Signature Finishing Package includes professional edge honing and pre-sealing at our Milton Keynes workshop.
What is the Free Photo Service?
Before your slab leaves our Milton Keynes yard, we photograph it and send you the picture. You see exactly what is arriving before it leaves us — no surprises on delivery day. Included on all Premium grade orders and all Standard grade orders with a service added.