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