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
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