Riven Black Slate Hearth – Standard Rectangle Cut to Size
Riven Black Slate Hearth – Standard Rectangle Cut to Size - 20mm / Up to - 90cm x 60cm - (XS) is backordered and will ship as soon as it is back in stock.
Express Brazilian Riven Black Slate Hearths
Our best-selling hearth material is this premium Black Slate, now available with fast 3-day delivery. Whether you’ve had a last-minute change of plans, an urgent installation, or issues with another supplier, our express service ensures your hearth arrives quickly and reliably.
This Express Slate Fireplace hearths are precision-cut to your required size, supplied with a natural riven surface and clean sawn edges, ready for use immediately or perfect if you want to trim on site. The blue-black tone and naturally varied riven texture make this slate suitable for both modern and traditional interiors, offering an authentic look
For fast turnarounds, tight budgets or simple DIY-friendly installations, our Express Slate Hearth service is the perfect solution.
To gain the best understanding of the stone’s natural characteristics, geological features and performance, please refer to the Specification tab where all technical information is provided in detail.
Easy Ordering Process
- ✓ Select your preferred thickness — 20mm, 30mm or 50mm
- ✓ Choose the base size closest to your required dimensions from the dropdown
- ✓ Enter your cut-to-size measurements — we’ll handle the rest
Key Features
- ✓ Square or rectangular only for express processing
- ✓ Precision cut to your requested size
- ✓ Clean sawn edges — supplied unsealed
- ✓ Fast 3-day delivery across the UK
- ✓ No hidden costs or unexpected delays
- ✓ Perfect for on-site trimming or DIY installation
| Product Specifications | |
|---|---|
| General | |
| Product Name | Brazilian Black Slate – Riven Hearth Grade |
| Material Type | Natural slate (metamorphic rock) |
| Category | Fire hearth slab / fireplace stone |
| Country of Origin | Brazil |
| Thickness Options | 20 mm, 30 mm, 50 mm |
| Dimensional Tolerance | All dimensions are cut to size with a manufacturing tolerance of ±5 mm. |
| Colour Description | Deep blue-black base tone with charcoal variation and occasional mid-grey shading |
| Surface Finish | Riven natural split surface ranging from smoother areas to more rugged, pronounced markings |
| Natural Variation | Medium–high variation in texture, tone and surface markings typical of riven slate |
| Edge Finishing Notes | All edges are precision machine-cut and then hand-sanded if needed. Due to the natural structure of slate sanding marks, slight tonal variations along the edges and occasional tiny micro-chips may be visible. |
| Weight | Approx. 70–140 kg per m² depending on thickness |
| Density | Approx. 2,800–2,900 kg per m³ |
| Technical Characteristics | |
| Heat Absorption / Retention | Good thermal mass, absorbing heat efficiently and dispersing it evenly |
| Maximum Temperature Resistance | Safe up to approx. 450–500 °C before thermal shock risk. Must not contact open flame. |
| Compressive Strength | Approx. 100–150 MPa |
| Flexural Strength | Approx. 15–25 MPa |
| Porosity | Low–medium |
| Water Absorption | Approx. 0.3–1.0% |
| Thermal Conductivity | Approx. 2.0–2.5 W/mK |
| Chemical Sensitivity | Resistant to weak acids, but strong acids may cause surface bleaching |
| Stain Resistance | Moderate, greatly improved with sealing |
| Salt Sensitivity | Very low Brazilian slate is naturally stable and salt-resistant |
| Natural Characteristics of Brazilian Slate | |
| General Nature of the Stone | Brazilian riven slate forms naturally along cleft layers, resulting in a varied surface with both smoother and more deeply textured areas. Variations in tone, riven height and shading are normal and part of the stone’s authentic appearance. |
| Colour Profile – “Black Slate” | Although marketed as “Black Slate,” the true colour is a blue-black rather than a deep pure black. Blue, graphite and charcoal tones occur naturally within the stone. This is considered the darkest natural slate available, but customers should expect tonal movement rather than a uniform flat black. |
| Colour Patches & Mineral Movement | Natural mineral variations produce patches, cloudy areas or soft streaks across the surface. These features are inherent to genuine slate and contribute to each hearth’s individual character. |
| Riven Surface Texture | The riven texture is created during natural splitting. Some areas are gently undulating, while others show more pronounced ridges or cleft lines. No two pieces are identical — this variation is expected and valued for its rustic appearance. |
| Pyrite / Fools Gold | Pyrite can appear as small metallic gold or bronze flecks. Although less common than in limestone, it does occur naturally in slate and may appear on cut edges where internal minerals are exposed. This is not considered a fault. |
| Production Enhancements | We may use epoxy fillers, edge refinements, localised smoothing or colour-enhancing treatments to improve the final appearance. These professional finishing methods are industry standard and not considered defects. |
| Application & Packaging | |
| Suitable For | Fire hearths, stove bases, fireplace chambers, inglenooks and interior stone features. |
| Application | Internal use |
| Sealing | Sealing is recommended to reduce marking, enrich colour and improve stain resistance. |
| Installation Notes | Install on a stable, level substrate. Do not allow direct contact with flame. Use adhesives and sealers designed for natural stone. |
| Packaging | Supplied on reinforced wooden pallets or crates with protective packaging. |
| Availability | Cut-to-size hearths available in 20, 30 and 50 mm thicknesses subject to stock. |
FAST UK DELIVERY — PRICED FAIRLY AND TRANSPARENTLY
We believe delivery should be clear, honest, and consistent. That’s why we don’t advertise “free delivery” while quietly building the cost into product prices or adding unexpected surcharges later in the checkout.
Instead, we charge delivery separately and transparently, so you can see exactly what you’re paying for, and so customers who order smaller quantities aren’t unfairly subsidising larger deliveries.
We deliver across the UK, including the Scottish Highlands & Isles, Northern Ireland, the Channel Islands, the Isle of Wight and the Isle of Man.
WHY WE DON’T OFFER “FREE DELIVERY”
There’s no such thing as truly free delivery — the cost has to be covered somewhere. Some retailers do this by:
- Increasing product prices to absorb delivery costs, or
- Adding extra charges at checkout (often based on delivery size/weight or certain postcodes)
Our approach is simple:
- Product prices stay product prices.
- Delivery is shown clearly and charged based on what it actually costs to send your order safely and on time.
DELIVERY CALCULATIONS
Delivery is calculated based on factors such as:
- Order size and weight
- The type of goods being shipped
- Delivery method (parcel, courier, pallet)
- Delivery location within the UK
You’ll always see the delivery cost clearly before you pay — simply enter your postcode at checkout and your delivery options will appear.
DISPATCH & DELIVERY TIMES
We aim to dispatch orders as quickly as possible, usually within 1–2 working days (subject to stock and order volume).
Delivery times vary depending on your location and the delivery method selected.
If your order is urgent, please contact us and we’ll do our best to help.
COLLECTION FROM OUR PETERBOROUGH DEPOT (PRIMETHORPE PAVING)
Collection is available from our Peterborough depot at Primethorpe Paving, Bungalow Business Park, PE6 7PP.
Please select the collection option at checkout (where available) or contact us to arrange a suitable time.
TRACKING & DELIVERY UPDATES
Where available, we’ll provide tracking details once your order has been dispatched.
ACCESS & DELIVERY RESTRICTIONS
To ensure a smooth delivery, please check:
- Access for large vehicles (if your order ships by pallet)
- That someone is available to receive the delivery
- Any site restrictions (narrow lanes, height limits, timed access, etc.)
If you’re unsure about anything, contact us before ordering, we’re happy to advise.
Express Brazilian Riven Black Slate Hearths
Our best-selling hearth material is this premium Black Slate, now available with fast 3-day delivery. Whether you’ve had a last-minute change of plans, an urgent installation, or issues with another supplier, our express service ensures your hearth arrives quickly and reliably.
This Express Slate Fireplace hearths are precision-cut to your required size, supplied with a natural riven surface and clean sawn edges, ready for use immediately or perfect if you want to trim on site. The blue-black tone and naturally varied riven texture make this slate suitable for both modern and traditional interiors, offering an authentic look
For fast turnarounds, tight budgets or simple DIY-friendly installations, our Express Slate Hearth service is the perfect solution.
To gain the best understanding of the stone’s natural characteristics, geological features and performance, please refer to the Specification tab where all technical information is provided in detail.
Easy Ordering Process
- ✓ Select your preferred thickness — 20mm, 30mm or 50mm
- ✓ Choose the base size closest to your required dimensions from the dropdown
- ✓ Enter your cut-to-size measurements — we’ll handle the rest
Key Features
- ✓ Square or rectangular only for express processing
- ✓ Precision cut to your requested size
- ✓ Clean sawn edges — supplied unsealed
- ✓ Fast 3-day delivery across the UK
- ✓ No hidden costs or unexpected delays
- ✓ Perfect for on-site trimming or DIY installation
| Product Specifications | |
|---|---|
| General | |
| Product Name | Brazilian Black Slate – Riven Hearth Grade |
| Material Type | Natural slate (metamorphic rock) |
| Category | Fire hearth slab / fireplace stone |
| Country of Origin | Brazil |
| Thickness Options | 20 mm, 30 mm, 50 mm |
| Dimensional Tolerance | All dimensions are cut to size with a manufacturing tolerance of ±5 mm. |
| Colour Description | Deep blue-black base tone with charcoal variation and occasional mid-grey shading |
| Surface Finish | Riven natural split surface ranging from smoother areas to more rugged, pronounced markings |
| Natural Variation | Medium–high variation in texture, tone and surface markings typical of riven slate |
| Edge Finishing Notes | All edges are precision machine-cut and then hand-sanded if needed. Due to the natural structure of slate sanding marks, slight tonal variations along the edges and occasional tiny micro-chips may be visible. |
| Weight | Approx. 70–140 kg per m² depending on thickness |
| Density | Approx. 2,800–2,900 kg per m³ |
| Technical Characteristics | |
| Heat Absorption / Retention | Good thermal mass, absorbing heat efficiently and dispersing it evenly |
| Maximum Temperature Resistance | Safe up to approx. 450–500 °C before thermal shock risk. Must not contact open flame. |
| Compressive Strength | Approx. 100–150 MPa |
| Flexural Strength | Approx. 15–25 MPa |
| Porosity | Low–medium |
| Water Absorption | Approx. 0.3–1.0% |
| Thermal Conductivity | Approx. 2.0–2.5 W/mK |
| Chemical Sensitivity | Resistant to weak acids, but strong acids may cause surface bleaching |
| Stain Resistance | Moderate, greatly improved with sealing |
| Salt Sensitivity | Very low Brazilian slate is naturally stable and salt-resistant |
| Natural Characteristics of Brazilian Slate | |
| General Nature of the Stone | Brazilian riven slate forms naturally along cleft layers, resulting in a varied surface with both smoother and more deeply textured areas. Variations in tone, riven height and shading are normal and part of the stone’s authentic appearance. |
| Colour Profile – “Black Slate” | Although marketed as “Black Slate,” the true colour is a blue-black rather than a deep pure black. Blue, graphite and charcoal tones occur naturally within the stone. This is considered the darkest natural slate available, but customers should expect tonal movement rather than a uniform flat black. |
| Colour Patches & Mineral Movement | Natural mineral variations produce patches, cloudy areas or soft streaks across the surface. These features are inherent to genuine slate and contribute to each hearth’s individual character. |
| Riven Surface Texture | The riven texture is created during natural splitting. Some areas are gently undulating, while others show more pronounced ridges or cleft lines. No two pieces are identical — this variation is expected and valued for its rustic appearance. |
| Pyrite / Fools Gold | Pyrite can appear as small metallic gold or bronze flecks. Although less common than in limestone, it does occur naturally in slate and may appear on cut edges where internal minerals are exposed. This is not considered a fault. |
| Production Enhancements | We may use epoxy fillers, edge refinements, localised smoothing or colour-enhancing treatments to improve the final appearance. These professional finishing methods are industry standard and not considered defects. |
| Application & Packaging | |
| Suitable For | Fire hearths, stove bases, fireplace chambers, inglenooks and interior stone features. |
| Application | Internal use |
| Sealing | Sealing is recommended to reduce marking, enrich colour and improve stain resistance. |
| Installation Notes | Install on a stable, level substrate. Do not allow direct contact with flame. Use adhesives and sealers designed for natural stone. |
| Packaging | Supplied on reinforced wooden pallets or crates with protective packaging. |
| Availability | Cut-to-size hearths available in 20, 30 and 50 mm thicknesses subject to stock. |
FAST UK DELIVERY — PRICED FAIRLY AND TRANSPARENTLY
We believe delivery should be clear, honest, and consistent. That’s why we don’t advertise “free delivery” while quietly building the cost into product prices or adding unexpected surcharges later in the checkout.
Instead, we charge delivery separately and transparently, so you can see exactly what you’re paying for, and so customers who order smaller quantities aren’t unfairly subsidising larger deliveries.
We deliver across the UK, including the Scottish Highlands & Isles, Northern Ireland, the Channel Islands, the Isle of Wight and the Isle of Man.
WHY WE DON’T OFFER “FREE DELIVERY”
There’s no such thing as truly free delivery — the cost has to be covered somewhere. Some retailers do this by:
- Increasing product prices to absorb delivery costs, or
- Adding extra charges at checkout (often based on delivery size/weight or certain postcodes)
Our approach is simple:
- Product prices stay product prices.
- Delivery is shown clearly and charged based on what it actually costs to send your order safely and on time.
DELIVERY CALCULATIONS
Delivery is calculated based on factors such as:
- Order size and weight
- The type of goods being shipped
- Delivery method (parcel, courier, pallet)
- Delivery location within the UK
You’ll always see the delivery cost clearly before you pay — simply enter your postcode at checkout and your delivery options will appear.
DISPATCH & DELIVERY TIMES
We aim to dispatch orders as quickly as possible, usually within 1–2 working days (subject to stock and order volume).
Delivery times vary depending on your location and the delivery method selected.
If your order is urgent, please contact us and we’ll do our best to help.
COLLECTION FROM OUR PETERBOROUGH DEPOT (PRIMETHORPE PAVING)
Collection is available from our Peterborough depot at Primethorpe Paving, Bungalow Business Park, PE6 7PP.
Please select the collection option at checkout (where available) or contact us to arrange a suitable time.
TRACKING & DELIVERY UPDATES
Where available, we’ll provide tracking details once your order has been dispatched.
ACCESS & DELIVERY RESTRICTIONS
To ensure a smooth delivery, please check:
- Access for large vehicles (if your order ships by pallet)
- That someone is available to receive the delivery
- Any site restrictions (narrow lanes, height limits, timed access, etc.)
If you’re unsure about anything, contact us before ordering, we’re happy to advise.
Perfect for my electric fire. I was very happy with the product but beware they are very heavy so you might need help moving it. Mine was the small size so goodness knows how heavy a large one would be.
From the initial order picking out the size I wanted to the confirmation email and the ease of picking a delivery date. The phone call within a couple of days to say that the item was already and palleted ready for delivery and would I want to move the delivery up, so item was delivered five days earlier than original order in wonderful condition very well packed beautifully cut size and looks stunning in place.
Cannot follow the company, customer services or service at any stage.
Truly, a great business that will continue to do well with service like this
Excellent quality stone.
Delivered exactly when promised, got us out of a tight spot after being let down elsewhere. Ordering couldn’t have been easier, excellent experience overall. Precision cutting was excellent with perfectly square edges. Top value when compared with local suppliers. Will order again in future, thanks team.
They’ve saved us twice now when jobs fell behind. Beautifully cut slate, packed safely, arrived fast.
Riven texture a bit rougher than expected. Still usable.
Edge detailing superb. Delivered faster than promised.
Fastest turnaround we’ve seen, top packaging and finish.
Never late, never damaged. Exactly how it should be.
Everything was spot on — size, finish, speed.
Beautifully finished piece, arrived in three days, well wrapped.
Looks great. Arrived just 3 days after ordering.
Arrived in 3 days, cut exact, looks gorgeous in place.
Primethorpe really got me out of a hole. Superb slate, quick turnaround.
Ordered Monday, fitted Thursday. That’s how it should be done.
Slate colour deep and even, fit was exact. Delivered super fast.
We’ve used them for a few rush jobs now. Always on time and perfectly finished.
Honestly surprised by the quality, cut beautifully and delivered in under 3 days.
Always well packaged and accurate. Quick 3-day service — can’t fault them.
We needed one fast — came in 3 days, accurate to the millimetre. Customers over the moon.
Was let down by another supplier, Primethorpe had mine ready in just 3 days. Great quality and perfectly cut.
Showed up early and helped carry the hearth in, much appreciated. Online process was smooth—good communication all the way. Colour and polish are spot on, looks superb once fitted. Great value considering how quickly it arrived. Highly recommended to anyone needing a hearth quickly.
Dispatch was lightning fast, much quicker than expected. Ordering was simple and quick, everything clear from checkout to delivery. Solid bit of stone, really nice finish. Great value considering how quickly it arrived. Highly recommended to anyone needing a hearth quickly.
Dispatch was lightning fast, much quicker than expected. Stone quality is brilliant—solid, smooth and well finished. Ordering was simple and quick, everything clear from checkout to delivery. Couldn’t be happier with the result.
Showed up early and helped carry the hearth in, much appreciated. Came in perfect condition, can see the care in cutting. Well worth the money for the finish received. Couldn’t be happier with the result.
Brilliant service, top job.
No issues whatsoever.
Spot on, thanks.
Brilliant service, top job.
Delivered exactly when promised, got us out of a tight spot after being let down elsewhere. Came in perfect condition, can see the care in cutting. Website was easy to use, very straightforward ordering process. Price was fair given the quality and speed of service. Would definitely use again.
Spot on, thanks.
No issues whatsoever.
