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Nyati Black Granite

Nyati Black Granite

Granite

South Africa

About

Item Details

Material Type:
Granite
Origin:
South Africa
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:
Nyati Black Gabbro
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:
0.10–0.25% by weight
Density:
2950–3050 Kg/m³
Flexural Strength:
18–25 MPa
Compressive Strength:
280–320 MPa

Description

Nyati Black Granite

Origin: South Africa

Stone Type: Gabbro (commercially classified as granite)

Nyati Black Granite is a premium deep, uniform black gabbro quarried in South Africa, highly regarded for its exceptional homogeneity, fine-grained structure, and consistent color. Unlike many black granites that show visible speckling or color variation, Nyati Black presents a clean, solid black appearance, making it ideal for contemporary, minimalist, and monumental architectural applications. Its dense crystalline structure delivers excellent mechanical strength, low porosity, and outstanding durability, suitable for both interior and exterior use, even in demanding environments.

Aesthetic Characteristics

Color

  • Base Color: Deep jet black
  • Visual Effect: Solid, uniform, and elegant
  • Color Consistency: Very high across blocks and slabs

Texture

  • Grain Size: Fine-grained
  • Surface Feel: Dense and compact
  • Visual Texture: Smooth and even, especially in polished finish

Pattern

  • Pattern Type: Homogeneous, non-directional
  • Movement: None to minimal
  • Veining: Absent Technical

Properties & Test Results (Typical values – may vary slightly by quarry block)

Mechanical Properties

  • Bulk Density: 2.95–3.05 g/cm³
  • Water Absorption: 0.10–0.25% by weight
  • Compressive Strength: 280–320 MPa
  • Flexural Strength: 18–25 MPa
  • Abrasion Resistance (Böhme): ≤18 cm³/50 cm²
  • Freeze–Thaw Resistance: Excellent
  • Hardness Mohs Hardness: 6.5 – 7
  • Scratch Resistance: Very high

Chemical Composition (% by weight – typical)

  • SiO₂: 45–50%
  • Al₂O₃: 14–16%
  • CaO: 9–12%
  • FeO + Fe₂O₃: 8–11%
  • MgO: 6–9%
  • Na₂O: 2–3%
  • K₂O: 0.5–1.5%
  • TiO₂ & trace oxides: <1%

Mineral Composition (% by weight – typical)

  • Plagioclase Feldspar: 45–55%
  • Pyroxene (Augite): 25–35%
  • Olivine (minor): 5–10%
  • Magnetite & Ilmenite: 3–6%
  • Quartz: <2% (typical of gabbro)

Applications

Interior Use

  • Flooring and staircases
  • Kitchen countertops and islands
  • Vanity tops and wall cladding
  • Fireplace surrounds

Exterior Use

  • Façades and ventilated cladding
  • Paving and hard landscaping
  • Monumental and memorial stone
  • Urban furniture and steps

Suitability Residential, commercial, hospitality, and public projects

Maintenance & Care

  • Requires minimal maintenance
  • Sealing recommended for polished surfaces in food-contact areas
  • Clean with neutral detergents and water
  • Resistant to stains, acids, frost, and UV exposure 

Surface Finish Options

  • Polished
  • Honed
  • Flamed
  • Leathered
  • Brushed
  • Sandblasted

Key Advantages

  • Extremely uniform deep black color
  • Fine-grained, dense crystalline structure
  • High compressive strength and abrasion resistance
  • Excellent performance in interior and exterior applications
  • Timeless, architectural, and monumental appearance

FAQ

Is Nyati Black Granite durable enough for use as walkway pavers?

Nyati Black Granite is a durable and hard natural stone, making it suitable for various applications, including use as walkway pavers. Granite, in general, is known for its strength, resistance to wear and tear, and ability to withstand harsh weather conditions. These properties make it an excellent choice for outdoor paving. However, there are a few considerations to keep in mind when using Nyati Black Granite for walkway pavers: 1. **Finish**: Ensure the granite has an appropriate finish for outdoor walkways, such as a flamed or bush-hammered finish, to provide the necessary slip resistance. 2. **Thickness**: The pavers should be adequately thick, typically at least 2-3 cm, to handle foot traffic and potential impacts. 3. **Sealing**: While granite is less porous than other natural stones, sealing the pavers may help prevent staining and enhance longevity. 4. **Installation**: Proper installation is crucial to prevent shifting and uneven surfaces. Ensure a suitable base and joint material are used. By considering these factors, Nyati Black Granite can be an excellent and durable choice for walkway pavers.

Does the surface of Nyati Black Granite scratch easily?

Nyati Black Granite, like other granites, is known for its durability and resistance to scratching. Granite is a very hard stone, typically ranking around 6-7 on the Mohs hardness scale, which makes it quite resistant to scratches from everyday use. However, no surface is completely scratch-proof. Certain activities or materials, such as using abrasive cleaners, dragging heavy objects with sharp edges, or cutting directly on the surface without a cutting board, can potentially cause scratches. For best results, it is always advisable to use protective measures like trivets, coasters, and cutting boards to maintain the pristine condition of the granite surface.

Can glossy polished finish Nyati Black Granite be used for pool coping?

While glossy polished finish Nyati Black Granite could technically be used for pool coping, there are several factors you should consider before making a decision. Polished granite tends to be very smooth and can become slippery when wet. This could pose a safety hazard around a pool area, where the risk of slipping is increased. For pool coping, its generally recommended to use materials that have a textured or honed finish to provide better traction. If you are set on using Nyati Black Granite, you might want to consider having it finished with a textured surface to increase safety. Additionally, make sure that the granite is adequately sealed to protect against water absorption, chlorine, and other chemicals that might be present in the pool environment. Always consult with a professional installer or a landscape architect to ensure that the materials used are appropriate for your specific application and meet all safety requirements.

Can 2cm thick Nyati Black Granite be used as a kitchen countertop?

Yes, 2 cm thick Nyati Black Granite can be used as a kitchen countertop. Granite is a popular choice for kitchen countertops due to its durability, heat resistance, and aesthetic appeal. However, a 2 cm (slightly less than 3/4 inch) thickness may require additional support to ensure structural integrity and prevent breakage, as thicker slabs (such as 3 cm) are generally more robust and less likely to crack. If you choose to use 2 cm thick granite, consider the following: 1. **Edge Support:** Ensure that appropriate edge support is provided to prevent chipping or cracking. Thicker edges can be achieved by laminating the edge, which involves attaching a strip of granite to the edge to give it a thicker appearance. 2. **Underlayment:** Support the granite with plywood or another sturdy underlayment to provide additional strength and stability. 3. **Span:** Minimize unsupported spans between cabinets, especially in areas where appliances like sinks or cooktops are installed. 4. **Professional Installation:** Consider using professional installers to ensure correct handling and support are provided during installation. With these considerations in place, a 2 cm thick Nyati Black Granite countertop can be a durable and attractive option for your kitchen.

How can I maintain Nyati Black Granite polished flooring?

Maintaining Nyati Black Granite polished flooring involves regular cleaning and proper care to preserve its natural beauty and avoid damage. Here are some steps to help you maintain your granite flooring: 1. **Regular Cleaning:** - **Sweeping/Dusting:** Use a soft-bristle broom or a dry microfiber mop to remove surface dirt and debris daily. This prevents scratching from dirt and grit. - **Mopping:** Damp mop the floor with warm water using a mild, pH-balanced cleaner specifically designed for natural stone. Avoid using acidic or harsh cleaners as they may etch the surface over time. - **Drying:** After mopping, dry the floor with a clean, dry cloth or a mop to prevent water spots. 2. **Spill Management:** - Wipe up spills immediately to prevent staining. Use a soft cloth or paper towel to blot the spill, rather than wiping, to avoid spreading. - For tougher spills, use a granite cleaner. 3. **Sealing:** - Granite is porous and may require sealing every 1-2 years, depending on the level of use and the stones porosity. Check the manufacturer’s recommendations. - To test if resealing is necessary, apply a few drops of water on the surface. If it soaks in and darkens the stone, it’s time to reseal. 4. **Avoid Damage:** - Use floor mats or area rugs at entryways to minimize dirt and grit on the flooring. - Place protective pads under furniture legs to prevent scratches or dents. - Avoid dragging heavy objects across the floor. 5. **Avoid Chemical Exposure:** - Keep acidic substances like vinegar, lemon juice, or ammonia away from your granite floors as they can dull and etch the surface. 6. **Periodic Polishing:** - To restore shine, you may need professional granite polishing about every few years, depending on traffic and wear. 7. **Regular Inspections:** - Periodically inspect the flooring for cracks, chips, or stained grout lines and address these issues promptly to maintain aesthetics and integrity. By following these steps, you can keep your Nyati Black Granite polished flooring looking beautiful and extend its lifespan. If you’re ever unsure about a product or technique, consult a professional to avoid potential damage.

Is Nyati Black Granite a suitable choice for facades in cold winter climates?

Nyati Black Granite can be a suitable choice for facades in cold winter climates due to its natural properties. Granite, in general, is known for its durability, resistance to temperature changes, and low water absorption, which makes it less susceptible to freezing and thawing cycles that can cause damage in cold climates. When considering Nyati Black Granite for facades, its important to ensure that it is properly sealed and installed to enhance its performance. The right sealant will further protect the stone from moisture infiltration and potential damage caused by freeze-thaw cycles. Additionally, ensuring that the installation process accommodates potential expansion and contraction due to temperature changes will help maintain the structural integrity of the facade. It is also beneficial to consult with a local architect or builder who has experience working with natural stone in cold climates. They can provide specific recommendations based on local weather conditions and building codes.

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