Negro Pinta Marble is a unique and aesthetically appealing natural stone quarried in Alconera, Badajoz, Spain. It features a striking black background that transitions into graphite grey, adorned with fine mottling known as "pintas." This high-density marble is known for its exceptional durability and resistance to wear, even under intensive use.

Physical and Mechanical Properties:

• Water Absorption: 0.1%
• Density: 2730 kg/m³
• Flexural Strength: 13.1 MPa
• Compressive Strength: 148 MPa
• Hardness: Typically rated on the Mohs scale, though specific value will be in line with other marbles' typical range (3-4).
• Porosity: Low, contributing to its minimal water absorption and high durability.
• Slip Resistance: Varies according to finish, but generally enhanced in honed or textured finishes.

Chemical and Mineral Composition:

• Calcium Carbonate (CaCO₃): The primary component, typical for marbles.
• Quartz (SiO₂): Present in trace amounts; affects hardness and resistance.
• Other Minerals: May include small quantities of graphite or other trace elements contributing to the stone’s unique coloration and patterns.

Usage:

Negro Pinta Marble is versatile and can be utilized in various applications:

• Interior Flooring: Ideal for high-traffic areas due to its wear resistance.
• Wall Cladding: Used for both aesthetic and functional design elements.
• Countertops and Vanities: Preferred for kitchen and bathroom surfaces due to low water absorption.
• Exterior Applications: Suitable for certain exterior uses, depending on finish and care provided.

Maintenance:

• Cleaning: Regular wiping with a damp cloth and non-abrasive cleaner.
• Sealing: Periodic sealing recommended to maintain resistance to staining and etching.
• Avoid: Harsh chemicals, acidic or abrasive cleaners.

Cutting Sizes and Surface Finish Options:

• Common Cutting Sizes: Available in both tile and slab formats, with sizes typically ranging from small tiles (30x30 cm) to large slabs (up to 300x180 cm) subject to quarry output.
• Surface Finishes:
• Polished: Offers a high-gloss finish, enhancing the stone's natural color and veining.
• Honed: Provides a matte finish, offering enhanced slip resistance ideal for flooring.
• Brushed/Antiqued: Creates a textured surface for a rustic appearance.
• Sandblasted: Rough texture, generally used for exterior applications for increased traction.
• Tumbled: Provides an aged look, often used for decorative elements.

Negro Pinta Marble is prized for its aesthetic appeal, robustness, and diverse application potential. Proper maintenance can ensure the longevity and beauty of installations, making it a preferred choice among designers and architects.

Negro Pinta Marble Description

Limestone re-crystallized of Cambrian age and of fine grain. Good quarrying characteristics. Medium to large blocks.

General Characteristics:

• Origin: Alconera
• Province: Badajoz
• Colour: Dark Grey

Petrographic Description:

Limestone partially dolomitized

Technical Properties:

• Open Porosity: 0.2 %
• Apparent Density: 2730 Kg/m³
• Abrasion Resistance: 25.5 mm
• Compressive Strength: 148 MPa
• Flexural Strength (concentrated load deflection): 13.1 MPa
• Microhardness (Knoop): 1873 MPa
• Impact Resistance: 24 cm
• Capillary Water Absorption: 0.14 g/m²·s⁰·⁵
• Frost Resistance (variation in flexural strength after cycles): 13 %
• Water Absorption at Atmospheric Pressure: 0.1 %
• Breaking Load: 2350 N