Sillar Gris

Basalt / Volcanic Stone

This material is recorded as a basalt / volcanic stone in grey, silver, black tones. Appearance can vary by bench and block selection. Recorded applications include cladding, carving, facades and paving.

Stone familyBasalt / Volcanic Stone

Primary colourGrey

Medium verification · Reference STN-0005146

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Specification snapshot

Indicative catalogue data. Verify the exact stone, finish, thickness and current test certificates before specification.

Mohs hardness4-6

Water absorption1.00-8.00 %

Compressive strength30-150 MPa

Flexural strength4-18 MPa

Density1900-2800 kg/m³

PorosityNot reported

Material profile

Character & application

Common finishes: Sawn, honed, brushed, sandblasted, chiseled
Typical uses: Cladding, carving, facades, paving, landscape, heritage
Exterior suitability: Good if selected/tested
Frost resistance: Variable
Recorded colour palette: Grey, Silver, Black
Slab variation: V3 Moderate variationModerate variation: veining, colour or pattern can change between slabs.