Know all about Banded iron formation and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Banded iron formation belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Obsidian is Glassy. Banded iron formation appears Layered, Banded, Veined and Shiny and Obsidian appears Shiny. The luster of Banded iron formation is earthy while that of Obsidian is vitreous. Banded iron formation is available in red, reddish brown colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Banded iron formation are as a touchstone, cemetery markers, creating artwork and that of Obsidian are creating artwork, mirror, used in aquariums.