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