Know all about Banded iron formation and Tachylite 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 Tachylite belongs to Igneous Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Tachylite is Vitreous. Banded iron formation appears Layered, Banded, Veined and Shiny and Tachylite appears Glassy. The luster of Banded iron formation is earthy while that of Tachylite is resinous. Banded iron formation is available in red, reddish brown colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Banded iron formation and Tachylite are as a touchstone, cemetery markers, creating artwork.