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