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