Know all about Variolite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Variolite and Obsidian belong to Igneous Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Obsidian is Glassy. Variolite appears Dull and Soft and Obsidian appears Shiny. The luster of Variolite is not available while that of Obsidian is vitreous. Variolite is available in black, brown, light to dark grey colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Variolite are cemetery markers, creating artwork and that of Obsidian are creating artwork, mirror, used in aquariums.