Pyrite gold cubes

Pyrite gold cubes: the mineral known as 'fool's gold' and its fascinating crystalline properties.

About this subject

Pyrite, also known as fool's gold, is an iron sulfide (FeS2) that often forms golden cubic crystals. Its name comes from the Greek 'pyr' (fire), as it sparks when struck against metal. Despite its deceptive appearance, pyrite contains no gold in its composition, though it can be associated with gold deposits. It is found worldwide, especially in hydrothermal veins, sedimentary and metamorphic rocks. Perfect cubic crystals are highly prized by collectors. In Brazil, occurrences include Minas Gerais, like the Morro Velho region, and Rio Grande do Sul. Pyrite also has industrial uses: it is employed in sulfuric acid production and historically as a source of sulfur. Its metallic color and intense luster make it popular in jewelry and decorative objects, though it is relatively fragile. Interestingly, pyrite can alter to limonite, an iron oxide, when exposed to moisture. In popular culture, the term 'fool's gold' serves as a caution against deceptive appearances.

Frequently Asked Questions

Does pyrite actually contain gold?

No, pyrite is iron sulfide and contains no gold. However, it can occur in geological settings where gold is also present, leading to the association.

Where can I find cubic pyrite crystals?

Cubic pyrite crystals are found in many places worldwide, such as Spain, Peru, and the United States. In Brazil, occurrences are in Minas Gerais and Rio Grande do Sul.

Does pyrite have any practical use?

Yes, pyrite is used in sulfuric acid production and historically as a source of sulfur. It is also popular in mineral collections and as an ornamental gem.