Know all about Obsidian and Hyaloclastite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Hyaloclastite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Hyaloclastite is Pyroclastic. Obsidian appears Shiny and Hyaloclastite appears Dull. The luster of Obsidian is vitreous while that of Hyaloclastite is dull and grainy. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Hyaloclastite is available in brown, grey, yellow colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Hyaloclastite are cemetery markers, creating artwork.