Know all about Tachylite and Coquina properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Coquina belongs to Sedimentary Rocks.Texture of Tachylite is Vitreous whereas that of Coquina is Clastic. Tachylite appears Glassy and Coquina appears Layered, Banded, Veined and Shiny. The luster of Tachylite is resinous while that of Coquina is dull to vitreous to submetallic. Tachylite is available in black, dark brown colors whereas Coquina is available in beige, buff, orange colors. The commercial uses of Tachylite and Coquina are cemetery markers, creating artwork.