Obama Gray Marble is a unique natural stone quarried in China. It is renowned for its striking resemblance to the grain and texture of natural wood, offering a sophisticated and organic aesthetic to architectural and design projects. This marble blends the visual warmth and elegance of wood with the strength and durability of natural stone, making it a highly sought-after material in the global market.

Appearance

Color: Predominantly cool-toned gray background with variations in intensity, ranging from light to dark gray. Hints of beige or taupe may occasionally be present, adding warmth and depth to the stone.

Texture: Fine to medium-grained crystalline structure typical of marble, providing a smooth and refined surface.

Pattern: Intricate wood-like veining and grain patterns that closely mimic the natural beauty of wood. Flowing, linear streaks or wavy patterns add a sense of movement and depth, enhancing the stone’s natural elegance.

Physical and Mechanical Properties

(Typical Test Results)

• Density: 2.65 - 2.68 g/cm³ (2650 - 2680 kg/m³)
• Water Absorption: 0.46% by weight (indicates moderate porosity, requiring sealing for certain uses)
• Compressive Strength: 108.4 MPa (suitable for most interior applications)
• Flexural Strength: 8.3 MPa
• Porosity: Generally low, typically <1% (consistent with marble’s fine-grained texture)
• Mohs Hardness: ~3-4 (softer than granite, typical for marble)
• Slip Resistance (COF):

        Polished finish: ~0.5-0.6 (less slip-resistant)

        Honed, brushed, or leathered finishes: improved slip resistance for flooring and wet areas.

Chemical and Mineral Composition

(% by weight, typical)

• Calcium Carbonate (CaCO₃): ~92-95% (calcite-rich)
• Magnesium Carbonate (MgCO₃): ~1-2%
• Quartz (SiO₂): ~0.5 - 1.0%
• Other minerals: Trace amounts of iron oxides (responsible for subtle warm shades) and clay minerals, contributing to the natural variations in tone and veining.

Usage

Interior applications:

• Floor tiles and large-format panels
• Wall cladding and feature walls
• Kitchen countertops, vanity tops, and backsplashes
• Stairs, risers, and fireplace surrounds
• Decorative accents and furniture applications

Exterior applications:

• Best suited for mild climates and protected areas, as marble can weather with exposure to freeze-thaw cycles.

Maintenance

• Sealing: Recommended to apply a penetrating sealer upon installation and reapply annually for optimal protection against stains and moisture.
• Cleaning: Use pH-neutral, stone-safe cleaners to avoid etching and maintain the marble’s natural luster.
• Polishing: Periodic re-polishing may be needed for high-traffic areas with polished finishes.
• Textured finishes: Brushed, leathered, or honed surfaces require less frequent polishing and offer better slip resistance.

Cutting Sizes

Slabs: Typically cut in large sizes: 240 cm × 120 cm (or customized sizes on request).

Tiles: Common dimensions: 30×30 cm, 60×60 cm, 60×120 cm.

Custom cutting and waterjet cutting are also available for unique design needs.

Surface Finish Options

• Polished: High-gloss finish, enhancing the stone’s natural color and veining for an elegant, luxurious appearance.
• Honed: Smooth, matte finish that reduces glare and is ideal for flooring or wall cladding.
• Brushed: Subtly textured surface with a soft sheen, creating a warm, tactile feel.
• Leathered: Softly textured and slightly matte, offering an organic, modern aesthetic with increased slip resistance.
• Sandblasted: Coarse, rugged finish ideal for exterior and slip-resistant applications.
• Tumbled: Softened edges and slightly antiqued finish for a rustic, natural look.