Visual Appearance:

• Color: Charcoal black base with fine to medium grain
• Pattern: Grey to white speckles scattered naturally throughout the surface
• Texture: Uniform and dense structure with low crystallinity
• Look: Subtle yet bold, natural volcanic elegance, minimal veining

Physical & Mechanical Properties

• Density .... ~2.90 g/cm³
• Water Absorption .... ~0.3–0.6%
• Porosity .... Low to moderate (5–10%)
• Compressive Strength .... ~180–210 MPa
• Flexural Strength .... ~18–25 MPa
• Hardness (Mohs) .... ~6
• Slip Resistance .... R10–R12 depending on finish

Chemical Composition (% by weight)

(Approximate range, varies slightly by quarry deposit)

• SiO₂ (Silicon Dioxide): ~49–52%
• Al₂O₃ (Aluminum Oxide): ~14–17%
• Fe₂O₃ (Iron Oxide): ~10–12%
• CaO (Calcium Oxide): ~8–10%
• MgO (Magnesium Oxide): ~3–5%
• Na₂O + K₂O (Alkalis): ~3–4%

Surface Finishes Available

• Polished – smooth, enhanced speckles, slightly reflective
• Honed – matte surface, muted color, uniform tone
• Flamed – rough texture, lighter speckling, slip-resistant
• Sandblasted – fine-grain texture, soft grey tone
• Brushed – aged feel, slightly wavy surface
• Tumbled – rounded edges, antique appearance
• Leathered – soft-textured matte finish with tactile feel

Common Cutting Sizes (in cm)

• Tiles: 30x30, 40x40, 60x30, 60x60, 80x40
• Slabs: Custom sizes (typically 240x120 cm or cut-to-size)
• Thickness Options: 1.5 cm, 2 cm, 3 cm, custom upon request

Applications

• Exterior: Facades, pavers, cladding, wall caps, coping
• Interior: Flooring, wall panels, staircases, fireplace surrounds
• Commercial/Public Spaces: High-durability flooring and plazas
• Landscaping: Pathways, curbs, decorative walls

Maintenance

Seal periodically (especially honed or brushed finishes) to prevent staining

Clean with pH-neutral cleaner

Avoid acidic or abrasive chemicals

Low maintenance compared to porous stones like limestone or sandstone