Pyrite

The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron(II) disulfide). Pyrite is considered the most common of the sulfide minerals.

It is mined and traded across the Union. It is used in various processes and materials. A mwtric ton exchanges for about 67,000 credits FOB

Pyrite

Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres (3.7 by 3.1 in), 512 grams (18.1 oz); main crystal: 31 millimetres (1.2 in) on edge)

General Category Sulfide mineral Formula (repeating unit) FeS2 Strunz classification 2.EB.05a Dana classification 2.12.1.1 Crystal system Isometric Crystal class Diploidal Identification Formula mass 119.98 g/mol Color Pale brass-yellow reflective; tarnishes darker and iridescent Crystal habit Cubic, faces may be striated, but also frequently octahedral and pyritohedron. Often inter-grown, massive, radiated, granular, globular, and stalactitic. Twinning Penetration and contact twinning Cleavage Indistinct on {001}; partings on {011} and {111} Fracture Very uneven, sometimes conchoidal Tenacity Brittle Mohs scale hardness 6–6.5 Luster Metallic, glistening Streak Greenish-black to brownish-black Diaphaneity Opaque Specific gravity 4.95–5.10 Density 4.8–5 g/cm3 Fusibility 2.5–3 to a magnetic globule Solubility Insoluble in water Other characteristics paramagnetic

Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.[5]

The name pyrite is derived from the Greekπυρίτης (pyritēs), "of fire" or "in fire",[7] in turn from πύρ (pyr), "fire".[8] In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel; Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite