Know all about Tachylite and Felsite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Felsite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Felsite is Arborescent Patterned, Vitreous. Tachylite appears Glassy and Felsite appears Layered, Banded, Veined and Shiny. The luster of Tachylite is resinous while that of Felsite is vitreous. Tachylite is available in black, dark brown colors whereas Felsite is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Felsite are mirror, jewelry.