Know all about Tachylite and Pegmatite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Pegmatite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Pegmatite is Pegmatitic. Tachylite appears Glassy and Pegmatite appears Layered, Banded, Veined and Shiny. The luster of Tachylite is resinous while that of Pegmatite is grainy, pearly and vitreous. Tachylite is available in black, dark brown colors whereas Pegmatite is available in black, brown, cream, green, grey, pink, red, rust, silver, white, yellow colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Pegmatite are creating artwork, jewelry, source of corundum, tourmalines, beryls and topaz.