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