Below you’ll find answers to the 16 most frequently asked questions about Belgian blue stone (Petit Granit). Source: our technical department, over a century of experience with natural stone, and our own Vinalmont quarry. What is its exact origin? How much does it cost per m²? How do you maintain it? And what’s the difference between it and Vietnamese or Chinese blue stone? Bookmark this page as a reference for your next project or renovation.
1. What exactly is Belgian blue stone? A limestone that formed about 350 million years ago on the floor of a tropical sea in what is now Wallonia. Geological pressure caused the rock to become extremely dense and compressed. Its characteristic blue-gray color comes from finely dispersed organic carbon between the calcite crystals. In Belgian technical terminology, it is called “arduin” or “Petit Granit.”.
2. What is the difference between blue stone and bluestone? No difference. “Arduin” is the Flemish technical term. “Petit Granit” is the official European designation of origin. “Belgian blue stone” is the commercial name. Three words for the same rock.
3. Where does Belgian blue stone come from? From a handful of Belgian quarries in Wallonia, mainly in the regions of Soignies, Gobertange, and Vinalmont. Our Vinalmont Quarry is managed in-house by Renier.
4. What are the technical specifications? Belgian blue stone is exceptionally dense and compressive-strength, with very low water absorption and high frost resistance in accordance with EN 12371.
Our Technical Specifications Page contains all official values.
5. Is Belgian blue stone certified? Yes. It bears the CE mark in accordance with, among others, EN 1469 (facade cladding), EN 1341 (paving), and EN 12058 (interior floor and stair coverings). Check out our certificates. “Petit Granit” has been recognized by the European Commission as a designation of origin.
6. What is the difference between this and Vietnamese blue stone? Vietnamese blue stone is geologically younger, less dense, and has a higher water absorption rate. Aesthetically comparable, but technically less durable for outdoor applications. See the full comparison on our page: Belgian vs. Vietnamese.
7. What is the difference between this and Chinese blue stone? The quality of Chinese blue stone varies depending on the quarry and exporter. Belgian blue stone is certified and traceable. For a detailed explanation, read our Chinese vs. Belgian Comparison.
8. What is the difference between this and granite? Granite is a volcanic rock; blue stone is limestone. Granite is slightly harder but more expensive and not Belgian. For patio applications, we compare the two on our terrace-selection-page.
9. How much does Belgian blue stone cost per square meter? The price depends on the application, size, thickness, and finish. For the exact price for your project: request a quote or for the B2B price list login requests.
10. Do I get a discount for large orders? For contractors and architects with a B2B account: Yes, with volume-based discounts. Learn more at wholesaler for contractors.
11. What is the delivery time? Standard sizes are available directly from stock, with a 1-2 week delivery time to the job site. Custom orders take 3-4 weeks. For large or complex projects, we provide exact delivery dates in the quote.
12. How do you maintain Belgian blue stone? Use water and pH-neutral soap. No harsh cleaners, no chlorine, no descaler. Our maintenance tips page and the cleaning products provide a full explanation for each situation.
13. Do I need to treat Belgian blue stone? For indoor use: not necessary because water absorption is low. For outdoor applications subject to heavy use (patios, driveways), impregnation can extend the lifespan and prevent staining. Our protection products are designed to complement blue stone.
14. What do you do if there are stains on blue stone? The type of stain determines the approach. Grease: rinse with dish soap and warm water. Rust: a specific rust remover (not citric acid). Glue residue: a specialized product. Our stain-removal-category has a recommended product for each type of stain.
15. How long does Belgian blue stone last? Under normal conditions, 100 years or more. Examples include Belgian cathedrals, Antwerp Central Station, and hundreds of centuries-old monuments made of Petit Granit that are still in their original condition.
16. For what applications is Belgian blue stone suitable? Outdoors: patios, driveways, foundation plinths, thresholds, stair treads, balcony finishes, pool edges. Indoors: floors, stair treads, countertops, window sills, ledges. Our product categories Group all applications.
Our technical support team will be happy to answer specific questions about your project. Call +32 16 550011 or email info@renier.be. For detailed purchasing advice, please request a quote with your project specifications.