Know all about Tachylite and Borolanite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Borolanite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Borolanite is Granular. Tachylite appears Glassy and Borolanite appears Banded and Foilated. The luster of Tachylite is resinous while that of Borolanite is greasy to dull. Tachylite is available in black, dark brown colors whereas Borolanite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Tachylite and Borolanite are cemetery markers, creating artwork.