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