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