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