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Negro Borba Granite

Negro Borba Granite

Black - Granite

Portugal

About

Item Details

Material Type:
Granite
Origin:
Portugal (Borba, Évora District, Alentejo)
Primary Color(s):
Black
Recommended Usage:
kitchen and bathroom countertops, monuments, building stone, ornamental stone, stairs, interior, exterior wall and floor applications, mosaic, waterjet pattern, wall panels, table tops, window sills, balustrades, columns, wall and pool copings, pool pavers, sculptures, fireplaces, pavers, cobbles, curbstone
Additional Names:
Nero Borba Granite, Granito Negro Borba, Negro Real Granite, Granito Negro Borba, Negro Borba, Negro Borba Granite
Finished Surface:
Polished,Flamed,Bush Hammered,Tumbled,Brushed,Honed,Split,Machine Cut,Natural Surface,Sandblasted,Acid Washing,Combed,Leathered,Water Jet,Filled,Chiseled,Pickling

Testing

Water Absorption:
<0.35 %
Density:
2680 - 2750 kg/m³
Flexural Strength:
12 - 15 MPa
Compressive Strength:
170 - 190 MPa
Stone texture:
characterized by a deep, uniform black background that conveys a strong, elegant and contemporary appearance, subtly enriched by very fine and evenly dispersed white to light gray mineral speckles that add slight visual texture without disrupting its overall consistency; the color remains highly stable with minimal variation across slabs, making it suitable for large, continuous surfaces.

Description

Negro Borba Granite is a luxurious natural stone quarried in the Borba region of the Évora District, Alentejo, Portugal. It is known for its deep, uniform black background that lends an elegant and contemporary appearance. This granite is subtly enriched by very fine, evenly dispersed white to light gray mineral speckles, which provide a subtle visual texture without disrupting its overall consistency. The color of Negro Borba Granite remains highly stable with minimal variation across slabs, making it suitable for large, continuous surfaces.

Physical and Mechanical Properties

  • Water Absorption: Low, typically less than 0.35%, indicating high density and minimal porosity.
  • Density: Approximately 2,680 - 2,750 kg/m³.
  • Flexural Strength: Estimated around 12 - 15 MPa, showing good resistance to bending and tensile stress.
  • Compressive Strength: Typically around 170 - 190 MPa, indicating excellent resistance to heavy loads and pressure.
  • Hardness: Approximately 6-7 on the Mohs scale, reflecting good resistance to scratches and abrasion.
  • Porosity: Very low, under 1%, ensuring reduced water absorption and stain resistance.
  • Slip Resistance: Moderate to high, especially when textured or finished with a non-slip surface.

Chemical and Mineral Composition

  • Quartz: Approximately 20-30%
  • Feldspar: Usually 40-60%, comprising both plagioclase and orthoclase.
  • Biotite and Other Micas: Around 5-10%
  • Amphibole and Pyroxene: Approximately 5-15%
  • Other Trace Minerals:Including minor amounts of magnetite and other iron oxides.

Chemical Composition:

  • SiO₂ (Silica): 70-75%
  • Al₂O₃ (Alumina): 12-15%
  • Fe₂O₃ (Iron Oxide): 1-6%
  • Other oxides: CaO, Na₂O, K₂O

Usage

  • Interior Applications: Countertops, flooring, wall cladding, stairs.
  • Exterior Applications: Facades, paving, outdoor flooring, pool coping.
  • Monuments and Sculptures: Due to its aesthetic appeal and durability.

Maintenance

  • Routine Cleaning: Use a pH-neutral cleaner to maintain the surface.
  • Sealing: Regularly seal to protect against stains and enhance longevity.
  • Avoid: Harsh chemicals and acidic cleaners that may erode the finish.

Surface Finish Options

  • Polished: High gloss, enhances color and veining, suitable for indoor applications.
  • Honed: Smooth, matte finish, offering a softer look while maintaining elegance.
  • Flamed: Textured, slip-resistant surface, ideal for outdoor use.
  • Bush-Hammered: Textured, rugged finish for slip resistance.

Negro Borba Granite is an exceptional choice for those seeking a steadfast, aesthetically elegant material that balances timeless beauty with robust functionality, suitable for both residential and commercial settings.

FAQ

Can Portugal's Negro Borba Granite be used in a dining room?

Yes, Portugals Negro Borba Granite can be used in a dining room. It is a versatile and durable material that can be used for various applications, including countertops, dining tables, flooring, and wall cladding. The black color of the granite can add a sleek and sophisticated look to the dining room, and its natural variation and patterns can create a unique and stylish aesthetic. Additionally, granite is known for its resistance to heat, scratches, and stains, making it a practical choice for a dining room surface that may be exposed to food and beverage spills.

Can Portugal's Negro Borba Granite be used in landscaping?

Yes, Portugals Negro Borba Granite can be used in landscaping. It is a durable and versatile type of granite that is commonly used for various outdoor applications, including landscaping. Its dark black color with subtle patterns can add a sophisticated and elegant look to outdoor spaces. It is often used for pathways, driveways, patio flooring, retaining walls, and other hardscaping elements. Additionally, it is resistant to weathering, making it a suitable choice for outdoor environments.

Can Portugal's Negro Borba Granite be used exterior applications in very humid climates?

Yes, Portugals Negro Borba Granite can be used for exterior applications in very humid climates. Granite is a highly durable and weather-resistant natural stone, making it suitable for various outdoor purposes including building facades, terrace flooring, and other exterior architectural elements. The Negro Borba Granite specifically is known for its dark and uniform color, which can add an elegant and classic touch to any outdoor space. Additionally, granite has low water absorption properties, making it resistant to water damage, which is particularly important in humid climates where moisture levels are higher.

Can Portugal's Negro Borba Granite be used outdoors?

Yes, Portugals Negro Borba Granite can be used outdoors as it is a highly durable and weather-resistant material. It is commonly used for exterior cladding, paving, and landscaping projects. However, it is important to properly seal and maintain the granite to ensure its longevity and preserve its appearance.

How thick is Portugal's Negro Borba Granite slabs?

I cannot access current data. However, in general, the thickness of Negro Borba Granite slabs commonly ranges from 2cm to 3cm (0.8 inches to 1.2 inches). A thicker slab can also be customized on special request.

Is Portugal's Negro Borba Granite an expensive stone?

I dont have access to the current market prices for granite. However, the cost of Negro Borba Granite can vary depending on factors such as the quality of the stone, the size, and the location of the supplier. It is best to get a quote from a reputable stone supplier to determine the cost of this stone.

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