What is Pyrite?


Pyrite is a brass-yellow mineral with a bright metallic luster. It’s primarily found in Spain, Peru, and the United States. Pyrite is often mistaken for gold and hence is also known as ‘Fool’s Gold’. It’s often used as a gemstone and is a popular choice for jewelry due to its unique appearance and spiritual significance.

Pyrite is a brass-yellow mineral that resembles gold, earning it the nickname ‘Fool’s Gold’. Its metallic luster and unique appearance make it a popular choice for jewelry and decorative items. The stone is often used in rings, necklaces, and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Sulfide
ColorPyrite is typically brass-yellow.
LusterIt has a metallic luster.
TransparencyPyrite is an opaque mineral.
OccurrencePyrite can be found worldwide, with significant deposits in Spain, Italy, and Peru.
FormationPyrite forms in various geological environments, including sedimentary, metamorphic, and igneous rocks, often in association with other sulfide minerals.
CleavagePerfect in two directions
Mohs Hardness6 to 6.5.
Specific GravityThe specific gravity of pyrite is approximately 4.8 to 5.2.
Diagnostic PropertiesMetallic luster, gold color, often cubic crystals.
Chemical CompositionFeS2
PleochroismPyrite does not exhibit pleochroism.
Crystal SystemIsometric/Cubic
Optical PropertiesIsotropic
Refractive IndexOpaque, no refractive index
BirefringenceNone (isotropic)
2V angleMeasured: 58° to 63°
DispersionPyrite has a low dispersion index.