Pietra Macigno Sandstone

Pietra Macigno is a distinct type of sandstone quarried in Greve in Chianti, Italy. It is characterized by its gray appearance with heterogeneous tones, adorned with indistinct dark streaks and speckled with sub-millimetric black and pearly inclusions. Here is a detailed breakdown of its properties, composition, uses, maintenance, and finishes:

Physical and Mechanical Properties:

• Water Absorption: 1.43%
• Density: 2620 kg/m³
• Flexural Strength: 14.1-14.9 MPa
• Compressive Strength: 90.3 MPa
• Hardness: While specific values might vary, sandstone generally offers moderate hardness, suitable for various applications.
• Porosity: Medium porosity which affects its water absorption and weathering properties.
• Slip Resistance: Generally good, depending on the surface finish, making it suitable for flooring use.

Chemical and Mineral Composition:

The specific chemical and mineral composition of Pietra Macigno can vary, but it typically includes:

• Quartz: Main mineral component, often comprising over 70% of the stone.
• Feldspar: Typically 10-15%
• Mica and other minerals: Can include biotite or muscovite in minor quantities.
• Cementing materials: Silica, calcite, or iron oxides might contribute to its binding characteristics.

Usage and Applications:

• Building Material: Widely used in construction and architectural detailing.
• Flooring and Paving: Suitable due to its strength and slip resistance.
• Wall Cladding: Both interior and exterior applications benefit from its visual appeal.
• Landscaping: Often used for various hardscaping features.
• Monuments and Sculptures: Occasionally, used depending on specific aesthetic and functional requirements.

Maintenance:

• Regular Cleaning: Gentle cleaning with pH-neutral products to preserve its natural look.
• Sealing: To reduce water absorption, it may need sealing, especially in high-moisture environments.
• Periodic Inspection: Regular examination for any wear or deterioration, addressing issues as they arise.

Cutting Sizes and Surface Finishes:

• Cutting Sizes: Available in a variety of standard and custom sizes, especially tiles and slabs, accommodating specific project needs.
• Common Surface Finishes:
• Polished: Enhances color and patterns, providing a glossy finish.
• Honed: Offers a smooth, matte finish for a more natural look.
• Bush-Hammered: Adds texture, improving slip resistance while showing a rugged appearance.
• Sandblasted: Provides a slightly rough texture, exposing the stone's granular detail.

Pietra Macigno is appreciated for both its aesthetic qualities and practical functionalities, making it an excellent choice for a variety of architectural and design projects. Proper care and maintenance will ensure its longevity and continued beauty in any application.

PHYSICAL-MECHANICALU.M. NORMA VAL. MIDDLE DEV. ST. 

• EN 13755-08 of pressure Atmospheric Water absorption... 1.43 % 0.06 
• EN 1936-07 Bulk density ... 2620 Kg/m3 40.2 
• EN 1936-07 Open Porosity...3.69 % 0.18 
• EN 12372-07 Resistance to bending with concentrated load  (Unprocessed) ...14.9 MPa  2.4 
• (EN 12371-03 after 48 cycles of freezing) ...14.1 MPa  2.6 
• EN 1926-07 compressive strength ...90.3 MPa  4.9 
• EN 14231-04 Slip resistance :

        - smooth finish (dry) USRV 67 0.8 

        - smooth finish (wet) USRV 59 3