Definition - What does Iron Pyrite mean?
Iron Pyrite, also known as pyrite, is iron sulfide with FeS2 as its chemical formula. It resembles gold due to its pale brass-yellow tinge and metallic luster, thus it is also called "fool's gold." It is a common mineral among sulfide minerals. It is generally related to other oxides or sulfides present in metamorphic rocks, sedimentary rocks, quartz veins, coal beds and fossils as a replacement mineral. It is used in making marcasite jewelry and it occurs in several habits and shapes.
Petropedia explains Iron Pyrite
Iron Pyrite rates hardness from 6 to 6.5 on the Mohs hardness scale, which is a scale that is used by geologists to describe the resistance of minerals to be scratched. It has a brassy yellow appearance but not as bright as gold. Despite the fact that it consists of high iron percentage, it is never used as an important source of iron. It is unstable in natural environment, as in nature, Iron Pyrite is always being destroyed or created. When exposed to water and air, it gets decomposed into sulfate and iron oxides. The sulfate which is released from the decomposition of Iron Pyrite is combined with water to produce sulfuric acid and leads to acidic rock drainage and ultimately to acid rain.