Know all about Tachylite and Quartzite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Quartzite belongs to Metamorphic Rocks.Texture of Tachylite is Vitreous whereas that of Quartzite is Foliated, Granular. Tachylite appears Glassy and Quartzite appears Lustrous. The luster of Tachylite is resinous while that of Quartzite is vitreous. Tachylite is available in black, dark brown colors whereas Quartzite is available in black, blue, brown, green, light grey, purple, white, yellow colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Quartzite are an oil and gas reservoir, as armour rock for sea walls, cemetery markers, commemorative tablets, in aquifers, laboratory bench tops, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones, used in aquariums.