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