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
If you require a more complex shape, angled cuts or decorative edge profiles, please explore our Bespoke Cut-to-Size Black Slate option.
| 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 |
| 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. |
At Primethorpe Paving, we strive to provide clear and straightforward delivery options to make your shopping experience seamless and transparent.
Below is a detailed breakdown of our delivery services.
Free Delivery*
Eligibility: Available on orders of £750 or more — this can include a single item or a combination of any products on our website.
Timeframe: 3–5 business days (exact delivery date provided at checkout)
Details: Enjoy complimentary delivery with no hidden fees on all eligible orders of £750 or more.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Standard Delivery (£65)
Cost: £65
Timeframe: 3–5 business days
Details: Available for all orders under £750. Reliable delivery within the stated timeframe.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Express Delivery (Additional £30)
Cost: +£30 on top of Standard Delivery
Timeframe: 1–2 business days
Details: Ideal for urgent orders. Orders placed before 12 PM are processed and shipped the same day.
Note: For orders over £750, you can upgrade to Express Delivery for an additional £30.
Smaller Items Delivery (£10)
Items: Jointing compound, cement, sealer, slurry, etc.
Cost: £10 per item
Additional Cost: £10 per additional item (up to 6 items). After 6 items, a flat rate of £60 applies.
Recess Covers Delivery (£20)
Cost: £20 per item
Additional Cost: £20 per additional item (up to 3 items). After 3 items, a flat rate of £60 applies.
Installation Essentials with Paving Orders (Free)
Cost: Free
Details: When smaller items or installation essentials (e.g., jointing compound, recess covers) are ordered alongside paving, cobble, walling, coping, or hearth products — delivery for these items is free.
Samples Delivery (Free)
Cost: Free
Details: All sample orders qualify for free delivery.
Bespoke Made-to-Measure Items Details:
Bespoke or made-to-measure items may take longer to deliver due to their custom nature. However, you will always receive an exact delivery date at checkout, so you’ll know precisely when to expect your order.
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
If you require a more complex shape, angled cuts or decorative edge profiles, please explore our Bespoke Cut-to-Size Black Slate option.
| 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 |
| 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. |
At Primethorpe Paving, we strive to provide clear and straightforward delivery options to make your shopping experience seamless and transparent.
Below is a detailed breakdown of our delivery services.
Free Delivery*
Eligibility: Available on orders of £750 or more — this can include a single item or a combination of any products on our website.
Timeframe: 3–5 business days (exact delivery date provided at checkout)
Details: Enjoy complimentary delivery with no hidden fees on all eligible orders of £750 or more.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Standard Delivery (£65)
Cost: £65
Timeframe: 3–5 business days
Details: Available for all orders under £750. Reliable delivery within the stated timeframe.
Exclusion Postcodes: IV40–49, IV51–54, KW15–17, HS, PA20, ZE, PA21–38, PA41–49, PA60–78, KA27–28, PH42–44, PO30–41, IM, JE, GY, BT — These postcodes will be charged at a higher delivery cost, provided upon enquiry.
Express Delivery (Additional £30)
Cost: +£30 on top of Standard Delivery
Timeframe: 1–2 business days
Details: Ideal for urgent orders. Orders placed before 12 PM are processed and shipped the same day.
Note: For orders over £750, you can upgrade to Express Delivery for an additional £30.
Smaller Items Delivery (£10)
Items: Jointing compound, cement, sealer, slurry, etc.
Cost: £10 per item
Additional Cost: £10 per additional item (up to 6 items). After 6 items, a flat rate of £60 applies.
Recess Covers Delivery (£20)
Cost: £20 per item
Additional Cost: £20 per additional item (up to 3 items). After 3 items, a flat rate of £60 applies.
Installation Essentials with Paving Orders (Free)
Cost: Free
Details: When smaller items or installation essentials (e.g., jointing compound, recess covers) are ordered alongside paving, cobble, walling, coping, or hearth products — delivery for these items is free.
Samples Delivery (Free)
Cost: Free
Details: All sample orders qualify for free delivery.
Bespoke Made-to-Measure Items Details:
Bespoke or made-to-measure items may take longer to deliver due to their custom nature. However, you will always receive an exact delivery date at checkout, so you’ll know precisely when to expect your order.
