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