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