Know all about Variolite and Foidolite properties here. All properties of rocks are important as they define the type of rock and its application. Variolite and Foidolite belong to Igneous Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Foidolite is Earthy. Variolite appears Dull and Soft and Foidolite appears Dull. The luster of Variolite is not available while that of Foidolite is subvitreous to dull. Variolite is available in black, brown, light to dark grey colors whereas Foidolite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Variolite are cemetery markers, creating artwork and that of Foidolite are cemetery markers, commemorative tablets, creating artwork.