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