description Marcasite Overview
Marcasite is an iron sulfide mineral with the chemical formula FeS2 and an orthorhombic crystal structure. It has a pale metallic appearance that can resemble pyrite, but marcasite is less stable and may deteriorate when exposed to moisture or air. The name is also used in jewelry contexts, where small faceted pieces of marcasite or, frequently, pyrite have been mounted in silver settings, especially in older decorative designs.
help Marcasite FAQ
What is the chemical formula of marcasite?
Marcasite has the chemical formula FeS2. It is an iron sulfide mineral with an orthorhombic crystal structure.
How does marcasite differ from pyrite?
Marcasite and pyrite share the formula FeS2, but they have different crystal structures. Marcasite is orthorhombic, while pyrite has a cubic structure.
Why can marcasite deteriorate?
Marcasite is less stable than pyrite and may deteriorate when exposed to moisture or air. This instability matters when storing specimens or using marcasite in jewelry.
What does marcasite look like?
It has a pale metallic appearance that can resemble pyrite. The mineral's metallic luster is one reason the two are sometimes confused.
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