Know all about Tachylite and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Nephelinite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Nephelinite is Aphanitic. Tachylite appears Glassy and Nephelinite appears Skeletal. The luster of Tachylite is resinous while that of Nephelinite is vitreous to metallic. Tachylite is available in black, dark brown colors whereas Nephelinite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).