1.hainan basalt lava stone 2.polished,honed,flamed,sandblasted,Calibrated 3.exterior wall tile,curb stone,paving stone,tops 1.lava stone is a common extrusive volcanic rock. It ... basalt is black or grey. 2.Surface Finishes: Sawn, Polished, Honed,Flamed, Sandblasted, Bush Hammered, Line Chiselled, Grooved Line 3.Sizes:300x300x10mm,305x305x10mm,400x400x12mm ...