Fayalite (/ˈfaɪ.əlaɪt/) is a mineral that belongs to the olivine group. The spelling of fayalite comes from the Portuguese island of Fayal in the Azores archipelago, where the mineral was first discovered. The pronunciation of Fayalite is straightforward: it's simply pronounced as faɪ.əlaɪt. Its chemical formula is Fe2SiO4, with the Fe representing iron and the Si representing silicon. Fayalite is found in a variety of rocks including basalt, gabbro, and granite.
A pure iron chrysolite of a greenish or brownish-black colour.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word Fayalite is derived from the location where it was first discovered, the Portuguese island of Faial, in the Azores archipelago. Faial is known as Ilha do Fogo (Island of Fire) due to its volcanic activity, and fayalite is a mineral commonly found in volcanic rocks. The term fayalite was coined by the German geologist Wilhelm Haidinger in 1827, combining the name of the island with the mineral suffix -lite.