Anden Phyllit

Anden Phyllit from Brazil typically presents a dark gray to nearly black base color, sometimes with subtle brown or greenish undertones, and is characterized by a slightly variegated, fine- to medium-grained crystalline appearance. The surface often shows a softly mottled or banded look caused by biotite-rich mineral concentrations, which can create darker “nest-like” patches and a gentle flowing pattern rather than sharp veining. Structurally, it is described more accurately as a dense, metamorphic biotite-rich gneiss (sometimes commercially labeled as phyllite) composed mainly of quartz, feldspar, and biotite, giving it a compact, interlocked crystalline texture. This structure results in a very hard, durable stone with low porosity, capable of taking a high polish while still showing a natural, slightly textured visual depth typical of Brazilian dark ornamental stones.

Appearance:

• Base Color: Dark gray to nearly black.
• Undertones: Subtle brown or greenish.
• Texture: Slightly variegated, fine- to medium-grained crystalline.
• Pattern: Softly mottled or banded with biotite-rich mineral concentrations.
• Structural Description: Dense, metamorphic biotite-rich gneiss.
• Main Components: Quartz, feldspar, and biotite.

Physical and Mechanical Properties

• Water Absorption: Very low due to low porosity.
• Density: Approximately 2.69 - 2.75 g/cm³, indicating a compact and dense structure.
• Flexural Strength: High, typically around 13 - 15 MPa.
• Compressive Strength: Very high, often exceeding 100 MPa.
• Hardness: High, making it suitable for high-traffic areas.
• Porosity: Low, contributing to its durability and low water absorption.
• Slip Resistance: Good, especially when textured or with a honed finish.

Chemical and Mineral Composition (% by Weight)

• Quartz: 30% - 40%
• Feldspar: 20% - 30%
• Biotite: 10% - 15%
• Other Minerals (including mica and minor constituents): 15% - 20%

Usage

• Interiors: Suitable for floors, walls, countertops, and decorative elements.
• Exteriors: Ideal for facades, outdoor flooring, and feature walls.
• Commercial Applications: Frequently used in high-traffic areas due to its durability.
• Architectural Designs: Popular in both contemporary and traditional settings for its aesthetic appeal.

Maintenance

• Cleaning: Regular sweeping and mopping with pH-neutral cleaners.
• Sealing: Recommended to enhance its low porosity and maintain the polished finish.
• Polishing: Occasional repolishing may be required, depending on the traffic and wear.

Cutting Sizes (cm)

• Common Slab Dimensions: 2 cm and 3 cm thicknesses are typical; custom slab sizes can vary but often cut into standard dimensions.
• Tile Sizes: Standard sizes like 30x30, 60x60, and custom cuts as required.

Available Common Surface Finish Options

• Polished: Highlights the natural color and crystalline texture.
• Honed: Offers a matte finish with good slip resistance.
• Brushed: Provides a textured surface with a softer feel.
• Leathered: A slightly rough-textured surface that retains the stone’s natural look.
• Flamed: A rough, slip-resistant surface suitable for outdoor use.

Anden Phyllit is a versatile and aesthetically pleasing stone with properties that make it suitable for a wide range of applications in both residential and commercial settings. Its durability and low porosity, combined with a striking appearance, make it an excellent choice for both interior and exterior uses. Regular maintenance can enhance its lifespan and preserve its beauty, ensuring that it remains a valued component in design projects.