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