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