Black Granite Decorative Boulder
314,89 €
314,89 €
Delivery in 3–15 days
Tax included.
Shipping calculated at checkout.
How much stone do I need?
How much stone do I need for the ground?
For pebbles and gravel:
• ±80 kg per m², based on a 5 cm layer.*For grain sizes >32 mm a thicker layer is required.• Consumption per big bag: 1000 kg = 0.625 m³.
• Coverage: ±12.5 m² with a 5 cm layer.
For pine bark:
• ±70 L per m², based on a 5 cm layer.
• Consumption per big bag: 1000 L = ±1 m³ = ±600 kg
• Coverage: ±14 m² with a 5 cm layer.
For volcanic rock, slate and chamotte:
• ±50 kg per m², based on a 5 cm layer.
• Consumption per big bag: 1000 kg = ±1 m³
• Coverage: ±20 m² with a 5 cm layer
How much stone do I need to fill a gabion?
Density of ±1,650 kg per m³.
The calculation is easy to understand with an example: for a gabion measuring 100x50x30 cm, do the following:
1x0.5x0.3 = 0.15 m³
0.15x1,650 = 247.50 kg of stone.
*It is always a good idea to allow 5% extra, as gabions widen slightly when filled and always take a little more stone than the theoretical calculation.
Please note!
PLEASE NOTE! Before buying, read this information about gravel and pebbles
Grain sizes are sieve sizes, not exact measurements
When we talk about stone of, for example, 60-80 mm, we mean that the stones pass through an 80x80 mm square mesh and do not pass through a 60x60 mm one. A stone 100 mm long and 65 mm wide can easily pass through that 80x80 mesh, because the mesh sorts by the width of the stone as it passes through, not by its total length. That is why it is normal for a percentage of stones to have some dimension above 80 mm or below 60 mm.
Machines do not sort 100% accurately
In addition, no industrial sorting process is perfect: there is always a small percentage of stone which, due to speed, irregular shape or pieces overlapping on the belt, does not pass correctly through the corresponding mesh and slips into the grade, so stones larger than stated may occasionally appear. This is normal for this type of product and is not considered a defect.
Breakage of pebbles
In pebbles over 60 mm, up to 10% of the stones may break during sorting, washing, loading and unloading. We currently have no machinery that completely prevents this breakage. The product photos show only real pieces: broken pieces have not been removed.
Dust and sand in the product
This product is not washed, so it contains dust, sand and even traces of other materials from processing and transport. This is no problem for its use: the stone washes itself over time, or you can rinse it with water before use if you prefer.
Colour can vary considerably between batches
This is natural stone, and the colour changes from one batch to another, sometimes noticeably. This is especially important for multi-toned stones such as Blanco Rosa: some batches come out very white and others very pink, within the same product. If the exact shade is very important for your project, we recommend not buying this type of product online, as we cannot guarantee that the batch you receive will match the photo or a previous purchase.
Returns
Please bear in mind that returns, especially of 1,000 kg big bags, are usually complicated and expensive because of the weight and volume of the material. If the return is not due to an error on our part, the costs and arrangement of the return transport are borne by the customer.
Black Granite Decorative Boulder
Decorative Black Granite Boulder (Size 100-200 mm)
The Black Granite Boulder is one of the most impressive and robust pieces in our collection. Thanks to its size and texture, it is the material of choice for landscaping projects seeking a solid, natural look with great visual impact.
Important note about the color and the material
It is essential to clarify that "Black" is the commercial name of the raw material (the type of granite rock it comes from). As you can see in the detailed product photographs, the stone is not a solid or jet black. It displays an elegant range of dark greys, anthracites and mineral veining typical of authentic granite. This variation in tone is precisely what gives it its natural beauty and keeps the garden from looking artificial.
✨ Why choose the 100-200 mm Black Granite?
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Large Format (100-200 mm): A bold size, ideal for being seen from a distance and for filling large spaces with just a few units.
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Granite Hardness: Unlike other limestone boulders that can crumble, this granite is virtually indestructible. It withstands frost, intense sun and the passing of decades unfazed.
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Effect with water: If installed in rainy areas or near fountains, the color intensifies, revealing deep nuances that enhance any outdoor design.
✅ Recommended Uses
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Gabion Filling: It is the perfect size for gabions. Its structural strength and grading ensure that the cages are filled firmly, creating decorative or retaining walls with a professional, modern finish.
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Garden Focal Points: Thanks to its scale, it works wonderfully for creating groups of decorative stones, surrounding century-old trees or marking out areas in a natural way.
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Modern Landscaping Projects: It combines perfectly with white gravel or composite wood, providing a sober, elegant contrast.
Technical Properties
- Material: High-density natural granite.
- Color: Anthracite grey / Dark (Commercial name: Black Granite).
- Grading: 100-200 mm (Large size).
- Maintenance: None. As a low-porosity stone, dirt does not adhere easily and it is cleaned by the rain.
If you are looking for the strength of granite in a generous format and a sober tone, the "Black" Boulder is the most resistant and honest choice for your project.
Frequently asked questions
What is the 100-200 mm Black Granite Boulder?
It is a decorative boulder made of high-density natural granite, with a grading of 100 to 200 mm, designed for landscaping with a solid, natural look.
Is it really black?
Not exactly: Black is the commercial name of the raw material. The stone shows dark greys, anthracites and mineral veining, as seen in the photographs.
What uses is it suitable for?
It is recommended for filling gabions, for focal points in the garden and for modern landscaping projects, where it combines with white gravel or composite wood.
How is it maintained?
Maintenance is none: as a low-porosity stone, dirt does not adhere easily and it is cleaned by the rain.
What happens to the color when it gets wet?
According to the product sheet, if it is installed in rainy areas or near fountains, the color intensifies and reveals deeper nuances.
Frequently asked questions about gravel, pebbles and decorative stone
¿Cuánta cantidad de Bolo decorativo Granito Negro necesito para mi jardín?
Depende del grosor de la capa que quieras aplicar. Como referencia, con una capa de unos 5 cm de espesor se necesitan aproximadamente 50-80 kg por m² (la cantidad exacta varía según la densidad del material). Calcula los metros cuadrados de la zona a cubrir y multiplícalos por el consumo por m² para saber cuántos sacos necesitas.
¿Es necesario poner malla antihierbas antes de extender Bolo decorativo Granito Negro?
Sí, recomendamos instalar una malla o geotextil antihierbas antes de extender la piedra. Así se evita el crecimiento de malas hierbas y se facilita el mantenimiento con el paso del tiempo.
¿Es un producto resistente a la intemperie?
Sí, es un material apto para exterior, resistente a la lluvia, el sol y las heladas. Al tratarse de un producto natural, es normal que existan ligeras variaciones de tono entre piezas.
¿Para qué usos se puede utilizar Bolo decorativo Granito Negro?
Es ideal para decoración de jardines, caminos, macetas, rocallas, bordes de plantación y zonas de bajo mantenimiento.
¿Cómo se limpia y mantiene con el tiempo?
No requiere mantenimiento especial. Si se ensucia con hojas, tierra o polvo, puede limpiarse con agua a presión o barriendo. Con el tiempo es normal que adquiera una pátina natural propia de la piedra.
