Etna Lava stone is a volcanic rock with plenty holes. The stone is formed from lava flowing from a volcano, the escaping gases caused the holes. During solidification the stone closed itself totally, so there is ample porosity but very limited permeability (the holes are not connected). The composition is basaltic, so very resistant against all chemicals. As the holes are not connected, wind blowing sand into it, also blows it away
again, resulting in a very low maintenance material. Stone is very strong very suitable for drive ways as it can handle heavy trucks. Spilled oil will disappear in full sunlight in a few weeks.