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