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
China 
