Püriidi

Püriidi is a Estonian word that translates to "pyrite" in English. Pyrite is an iron sulfide mineral with the chemical formula FeS₂. It is known for its pale brass-yellow color and its strong metallic luster, which has led to it being called "fool's gold." Pyrite is one of the most common sulfide minerals found in the Earth's crust and occurs in a variety of geological environments, including sedimentary rocks, metamorphic rocks, and hydrothermal veins.

Historically, pyrite has been used for various purposes. It was once used as a source of sulfur dioxide for the production of sulfuric acid, although this practice has largely been replaced by other methods. Pyrite has also been used in jewelry and decorative objects due to its attractive appearance. In some cases, it has been mistaken for gold by prospectors, leading to its nickname.

Geologically, pyrite is an indicator mineral. Its presence can suggest certain conditions of formation in rocks. For instance, it often forms in environments where there is a lack of oxygen. While not a valuable mineral in terms of precious metals, its abundance and distinct characteristics make it a significant component of geological study. The word "püriidi" in Estonian simply refers to this mineral.