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