Know all about Rapakivi Granite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Rapakivi Granite and Tachylite belong to Igneous Rocks.Texture of Rapakivi Granite is Granular, Phaneritic whereas that of Tachylite is Vitreous. Rapakivi Granite appears Veined or Pebbled and Tachylite appears Glassy. The luster of Rapakivi Granite is dull to grainy with sporadic parts pearly and vitreous while that of Tachylite is resinous. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Rapakivi Granite and Tachylite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones.