Know all about Obsidian and Diabase properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Diabase belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Diabase is Aphanitic, Granular. Obsidian appears Shiny and Diabase appears Vesicular. The luster of Obsidian is vitreous while that of Diabase is not available. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Diabase is available in dark grey to black colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Diabase are an oil and gas reservoir, cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.