Know all about Tachylite and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Gossan belongs to Metamorphic Rocks.Texture of Tachylite is Vitreous whereas that of Gossan is Rough, Sandy. Tachylite appears Glassy and Gossan appears Dull and Banded. The luster of Tachylite is resinous while that of Gossan is metallic. Tachylite is available in black, dark brown colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Gossan are cemetery markers, commemorative tablets, gemstone.