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