Grey - Basalt
Quarry Location: Auvergne Volcano, Clemont-Ferrand, Dept. Puy-de-Dome, Massif Central
Water Absorption: 3-5 By weight %
Density: 1980 - 2180 kg/m3
Flexural Strength: 19.0 MPa
Compressive Strength: 63.0 MPa
Recommended Usage: Exterior - Interior wall and floor applications, countertops, mosaic, fountains, pool and wall capping
Finishing Surface: Sawn Cut, Sanded, Rockfaced, Sandblasted, Bushhammered, Tumbled, Thermalled, Natural Cleft, Weatheredge
Additional Names: Andesit Volvic,Lave Basaltique,Andesite de Volvic,Lava Volvic,Lave de Volvic,Lave Volvic,Pierre de Volvic,Volvic Lava,Auvergne Lava Stone,Auvergne Andesite,Auvergne Lavastone,Schiste Volvic,Volvic Basalt
Volvic Basalt is a dark grey color porous dense aphanitic igneous rock.
Physical Properties
Volvic lava is resistant to all climatic conditions.
It is frost resistant.
No expansion from 0‐100 degrees.
Average conductivity λ K cal (over) h.m.°C = 0.42
Average density 2.2
Average porosity (un‐glazed) 22.4%
Compression resistance; 63 MPA
Flex resistance 19 MPA
Chemical Analysis %
Silica (Si02) 57.5
Alumina (Al2O3) 17.4
Titanium (Ti) 1.5
Iron (Fe) 6.7
Manganese (Mo) 0.3
Calcium (Ca 0) 4.2
(Mg 0) 2.5
Sodium (Na2 0) 5.2
Potassium (K2 0) 3
Sulpher Dioxide (S 03) 0.4
Phosphorus (P2 05) 0.4
Loss of weight if fired @ 1050° 0
Total 99.3