Know all about Tachylite and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Adakite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Adakite is Porphyritic. Tachylite appears Glassy and Adakite appears Dull and Soft. The luster of Tachylite is resinous while that of Adakite is grainy, pearly and vitreous. Tachylite is available in black, dark brown colors whereas Adakite is available in black, brown, light to dark grey colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Adakite are commemorative tablets, pottery, used in aquariums.