Marengo Grey Marble

Marengo Grey Marble is an elegant grey natural stone with homogeneous grey tones and fine-to-medium grain, offering a versatile aesthetic suitable for urban and architectural applications. Its neutral yet refined appearance, combined with high durability, makes it ideal for interior and exterior floors, walls, and cladding.

Petrographic family: Calcitic-dolomitic marble (predominantly calcitic metacarbonated rock)

Origin / Quarry: Alconera, Badajoz, Spain 

Chromatic description: Uniform grey, fine-to-medium grain

Physical-Mechanical Properties (UNE‑EN Standards)

• Apparent Density (EN 1936): 2,730 kg/m³
• Open Porosity (EN 1936): 0.2 %
• Water Absorption (EN 13755): 0.1 %
• Compressive Strength (EN 1926): 148 MPa
• Flexural Strength (EN 12372): 17.8 MPa
• Abrasion Resistance (EN 14157:2024): 20.5 mm
• Frost Resistance (EN 12371, 168 cycles): 0 %
• Slip Resistance:

        - CEN/TS 16165:2016 – wet cut: 50

        - UNE 41901:2017 – bush-hammered wet: 79

        - CEN/TS 16165:2016 – bush-hammered wet: 79

• Impact Resistance (UNE-EN 14158:2004): 2 J
• Thermal Shock Resistance (UNE-EN 14066:2013): –1.3 %
• Reaction to Fire (EN 13501-1): A1 – Non-combustible
• Elastic Modulus (EN 14580): ≈ 75 GPa
• Solar Reflectance Index (ASTM E1980, TECNALIA): 54.4

Chemical & Mineral Composition

• Matrix (CaCO₃): 75.46 %
• Dolomite (CaMg(CO₃)₂): 21.93 %
• Traces:

        - FeCO₃: 0.72 % , 

        - SiO₂: 1.43 %, 

        - Al₂O₃: 0.46 %

• Oxide equivalents (stoichiometric conversion, not quantitative):

        - CaO: 48.95 %

        - MgO: 4.79 %

        - FeO (Fe₂O₃ equiv.): 0.50 %

        - SiO₂: 1.43 %

        - Al₂O₃: 0.46 %

• Loss on ignition (≈CO₂): 43.92 %
• Mohs Hardness: ≈ 3–3.5

Applications & Usage

• Flooring (interior and exterior)
• Wall cladding and facades
• Stairs, thresholds, skirting, handrails
• Countertops, bathroom vanities, and furniture tops
• Public spaces, commercial areas, and architectural features
• Urban and high-traffic areas due to abrasion resistance

Maintenance

• Use pH-neutral cleaners; avoid acids
• Seal polished and honed surfaces for stain protection
• Regular dusting and damp cloth cleaning recommended