Know all about Tachylite and Foidolite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Foidolite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Foidolite is Earthy. Tachylite appears Glassy and Foidolite appears Dull. The luster of Tachylite is resinous while that of Foidolite is subvitreous to dull. Tachylite is available in black, dark brown colors whereas Foidolite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Foidolite are cemetery markers, commemorative tablets, creating artwork.