|iron pyrites, Also called: pyrites, Nontechnical name: fool's gold a yellow mineral, found in igneous and metamorphic rocks and in veins. It is a source of sulphur and is used in the manufacture of sulphuric acid. Composition: iron sulphide. Formula: FeS2. Crystal structure: cubic|
|[C16: from Latin pyrites flint, from Greek puritēs (lithos) fire (stone), that is, capable of withstanding or striking fire, from pur fire]|
|pyrite (pī'rīt') Pronunciation Key
A silver to yellow, metallic, cubic mineral. Pyrite often crystallizes in cubes or octahedrons but also occurs as shapeless masses of grains. It occurs in most types of rocks, and is used as a source of iron and in making sulfur dioxide. It is a polymorph of marcasite. Because of its shiny look and often yellow color, it is sometimes mistaken for gold and for this reason is also called fool's gold. Chemical formula: FeS2.