Know all about Basalt and Variolite properties here. All properties of rocks are important as they define the type of rock and its application. Basalt and Variolite belong to Igneous Rocks.Texture of Basalt is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Basalt appears Dull and Soft and Variolite appears Dull and Soft. The luster of Basalt and Variolite is not available. Basalt and Variolite are available in black, brown, light to dark grey colors. The commercial uses of Basalt are an oil and gas reservoir, commemorative tablets, creating artwork, used in aquariums and that of Variolite are cemetery markers, creating artwork.