1) Copper mineral 
Icosahedrite is the only known naturally occurring quasicrystal phase. It has the composition Al63Cu24Fe13 and is a mineral approved by the International Mineralogical Association in 2010. Its discovery followed a 10-year-long systematic search by scientists to find the first natural quasicrystal. It occurs as tiny 0.1 mm grains in a small terrest...