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