Najran Black Granite

Najran Black Granite is a distinctive and attractive natural stone quarried in Najran, Saudi Arabia. Known for its durability and aesthetic appeal, this granite is characterized by its medium to coarse grain and charcoal-black color, complemented by light grey intrusions that give it a unique and striking appearance.

Physical and Mechanical Properties

• Water Absorption: Typically low, indicating good resistance to moisture and making it suitable for a variety of applications including countertops, flooring, and exterior use.

• Density: Approximately 2,690 - 2,750 kg/m³; reflecting its solid nature and robust quality.

• Flexural Strength: Around 17 - 22 MPa; indicating good strength under stress and making it less prone to cracking.

• Compressive Strength: Approximately 180 - 200 MPa; showcasing high resistance to being crushed or deformed under pressure.

• Hardness: Generally ranks around 6-7 on the Mohs scale, indicating good scratch resistance.

• Porosity: Very low, contributing to its durability and resistance to weathering and staining.

• Slip Resistance: Can be moderate to high depending on the surface finish, ensuring safety in both wet and dry conditions.

Chemical and Mineral Composition (Approximate % by Weight)

• Quartz: 20-35%
• Feldspar: 50-60%
• Mica (Biotite/Black Mica): 5-10%
• Minor Minerals: Including amphiboles, magnetite, etc., typically 5%
• Trace Elements & Oxides: Such as iron oxides, contributing to color and patterns.

Usage

• Residential: Often used for kitchen countertops, vanities, flooring, fireplaces, and wall cladding due to its aesthetic appeal and durability.

• Commercial: Suitable for large flooring areas, external cladding, columns, and as decorative elements in lobbies and public areas due to its strength and low maintenance.

• Outdoor Applications: Ideal for garden pathways, driveways, and building facades because of its resistance to weathering.

Maintenance

• Regular cleaning with mild soap and water is recommended.
• Sealing on a periodic basis may be advised to maintain its appearance and resist staining.
• Avoid acidic or harsh chemical cleaners that may damage the surface.

Cutting Sizes (Common)

• Slabs: 2 cm and 3 cm thickness are standard.
• Tiles: Commonly cut in sizes such as 30x30 cm, 60x60 cm, 60x30 cm.
• Custom sizes are available upon request, depending on the project requirements.

Surface Finish Options

• Polished: High-gloss finish that enhances the color and patterns but may reduce slip resistance.

• Honed: Matte finish offering a smooth surface with better slip resistance.

• Flamed: Rough texture achieved by blasting the stone surface with high-temperature, ideal for outdoor applications.

• Brushed: Slightly textured surface providing a comfortable walking surface with a natural appearance.

• Leathered: Provides a soft sheen with a textured feel, balancing between rustic and refined aesthetics.

Overall, Najran Black Granite is a versatile and highly functional stone that adds elegance to various architectural and decorative projects while offering robustness and longevity.