Know all about Nephelinite and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Chert belongs to Sedimentary Rocks.Texture of Nephelinite is Aphanitic whereas that of Chert is Banded, Rough. Nephelinite appears Skeletal and Chert appears Glassy or Pearly. The luster of Nephelinite is vitreous to metallic while that of Chert is waxy and dull. Nephelinite is available in black, brown, colourless, green, grey, white colors whereas Chert is available in black, brown, green, grey, red, white colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.