Pyrite
Pyrite · Mineral Specimen
Crystal System
Cubic (Isometric), often forming cubic, pyritohedral, or octahedral crystals, frequently found as massive, granular, or nodular aggregates.
Mineral Group
Sulfides
Chemical Formula
FeS2
Formation Process
Forms under wide temperature ranges via hydrothermal veins, in sedimentary rocks like shales and coal beds through chemical precipitation, and as an accessory mineral in igneous rocks.
About This Crystal
The specimen appears as a small, metallic, brass-yellow nugget resting on a wooden surface, displaying the characteristic metallic luster and granular or crystalline facets of iron pyrite.
Physical Characteristics
Color is pale brass-yellow; streak is greenish-black to brownish-black; cleavage is indistinct; fracture is conchoidal to uneven; specific gravity is approximately 5.0; tenacity is brittle.
Optical Properties
Opaque with a strong metallic luster. It is not transparent or translucent, and exhibits a bright, brassy reflection.
Hardness & Durability
Origin Region
Found worldwide, with notable deposits in Peru, Spain, Italy, and the United States (such as Colorado). Forms in igneous, metamorphic, and sedimentary rocks.
Hardness & Durability
Mohs hardness is 6 to 6.5, making it relatively hard, but it is brittle and can shatter under heavy impact. Not commonly worn in delicate jewelry due to potential tarnish and fragility.
Care & Maintenance
Clean with a soft dry cloth or gentle warm soapy water. Avoid harsh chemicals, acids, and prolonged exposure to moisture, as pyrite can oxidize (rust) and deteriorate.
Rarity & Value
Common. Value depends on specimen perfection, crystal size, and matrix quality. Generally affordable, though pristine crystal clusters can command higher prices among collectors.
Special Characteristics
Often called 'Fool's Gold' due to its metallic golden sheen which resembles real gold. It can produce sparks when struck against steel.
Lore & History
Historically used to strike fire (hence the Greek root 'pyr' meaning fire). In modern metaphysical practices, it is traditionally associated with abundance, vitality, willpower, and the solar plexus chakra, though these remain traditional beliefs rather than scientific claims.