M MineralystRock & Mineral Guide
Mineral

Pyrrhotite

Pyrrhotite — reference photo

Pyrrhotite is a mineral with the chemical formula Fe1-xS (where x = 0 to 0.2). It has a Mohs hardness of 3.5 - 4.5 and metallic luster.

Pyrrhotite properties

TypeMineral
Chemical formulaFe1-xS (where x = 0 to 0.2)
Mohs hardness3.5 - 4.5
LusterMetallic
Typical colorsBronze to brass-yellow
FormationTypically forms in igneous and metamorphic environments, often associated with nickel and copper deposits.
Rarity5 / 10

Mohs hardness 3.5–4.5 — soft

1 · Talc5 · Apatite10 · Diamond
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