Description of Pietra di Santa Brigida

Pietra di Santa Brigida is a fine-grained, compact, high-density sandstone characterized by its smoky silver-grey color. This natural stone is quarried in Monte Senario, Vaglia, near Florence, Italy. Known for its elegance and durability, it is a popular choice for various architectural applications.

Physical and Mechanical Properties

• Color: Smoky silver-grey
• Water Absorption: 1.52%
• Density: 2610 kg/m³
• Flexural Strength: 13.7 to 15.2 MPa
• Compressive Strength: 103 MPa
• Hardness: Typically assessed by the Mohs scale, sandstones like Pietra di Santa Brigida generally range from 6 to 7.
• Porosity: Generally low due to its compact nature, contributing to durability and strength.
• Slip Resistance: Good slip resistance, making it suitable for both indoor and outdoor applications.

Chemical and Mineral Composition (% by weight)

• Quartz: Predominantly high, as in most sandstones, usually around 65-75%
• Feldspar: Approximately 10-15%
• Mica: 5-10%
• Calcite and Clay Minerals: Smaller percentages, contributing to the stone's unique texture and color
• Other Minerals: Trace amounts of iron oxides and other minerals that may influence specific color variations.

Usage

Pietra di Santa Brigida is highly valued in construction and decoration due to its aesthetic appeal and strength:

• Exterior Applications: Cladding, paving, and facade elements where durability and weather resistance are crucial.
• Interior Applications: Flooring, wall paneling, and decorative elements that benefit from its elegant grey tones.
• Monumental Uses: Statues, columns, and other sculptural works leveraging the stone's fine grain and workability.

Maintenance

• Cleaning: Regular sweeping and occasional washing with mild soap and water.
• Sealing: Periodic sealing recommended to protect against stains and moisture intrusion, especially in high-traffic or exposed areas.
• Avoid Harsh Chemicals: Use non-acidic cleaning agents to prevent damage to the stone surface.

Cutting Sizes

• Standard Slabs and Tiles: Often available in various standard sizes such as 30x30 cm, 40x40 cm, etc.
• Custom Sizes: Available upon request for special projects or unique architectural needs.

Available Surface Finishes

• Polished: Offers a glossy finish that enhances the stone's natural color and pattern.
• Honed: Provides a smooth, matte finish that is less reflective, suitable for a contemporary look.
• Bush-Hammered: A rougher finish that provides good slip resistance, ideal for outdoor surfaces.
• Sandblasted: A textured finish that offers a fine, granular surface.
• Brushed: Gives an aged appearance, creating a soft, slightly textured feel.

Conclusion

Pietra di Santa Brigida is a versatile and attractive sandstone with excellent physical properties and various finishes, making it suitable for diverse architectural and decorative applications. Proper maintenance and selection of the right finish and size can significantly enhance its performance and appearance in any setting.

U.M. NORMA VAL. MIDDLE DEV. ST.

EN 13755-08 of pressure Atmospheric Water absorption ...1.52 %   0.09

EN 1936-07 Bulk density ... 2610 Kg/m3  5.5 

EN 1936-07 Open Porosity...% 3.78   0.36

EN 12372-07 Resistance to bending with concentrated load(Unprocessed) ...15.2 MPa   0.9

(EN 12371-03 after 48 cycles of freezing) ... 13.7 MPa   0.4

EN 1926-07 Compressive strength ...103 MPa  14.9

EN 14231-04 Slip resistance smooth finish :

 - (dry) USRV 70 5 smooth finish

 - (wet) USRV 58 8