Pyrite
Pyrite is one of the most common sulfide minerals and is also known as "Fool's Gold" due to its beautiful crystal forms and golden luster. It is sometimes found replacing fossils in sedimentary rock or occurring in unique shapes.
A typical cube-shaped pyrite crystal
Basic Information
| English Name | Pyrite |
|---|---|
| Japanese Name | Ōtekkō |
| Chemical Formula | FeS2 |
| Crystal System | Isometric |
| Hardness | 6–6.5 |
| Specific Gravity | 5.0 |
| Transparency | Opaque |
Characteristics & Varieties
- Crystal Form: Found in distinct shapes such as cubes or pyritohedrons. Striations are often visible on the surface.
- Varieties: Rainbow pyrite (iridescent coating), pyrite balls (spherical aggregates), pyrite suns, etc.
- Common Name: Known by the nickname "Fool's Gold."
Treatments, Similar Stones & Related Info
Treatments: Surfaces may be coated with lacquer or titanium alloy.
Similar Stones: Marcasite, which has a paler color.
Related: In Takeishi Village, Nagano Prefecture, pyrite that has altered into goethite is found, referred to as a "pseudomorph."
Precautions: Pyrite is brittle and its crystal corners are prone to chipping, so handle with care. Additionally, specimens that undergo alteration may emit a sulfuric odor or leave a sour taste.