Know all about Tachylite and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Comendite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Comendite is Porphyritic. Tachylite appears Glassy and Comendite appears Foliated. The luster of Tachylite is resinous while that of Comendite is dull. Tachylite is available in black, dark brown colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Tachylite and Comendite are cemetery markers, creating artwork.