Know all about Dacite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Dacite and Tachylite belong to Igneous Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Tachylite is Vitreous. Dacite appears Vesicular and Tachylite appears Glassy. The luster of Dacite is subvitreous to dull while that of Tachylite is resinous. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Tachylite are cemetery markers, creating artwork.