6 Photos
Berthierite
Chemical Formula	FeSb2S4
Species	Sulfides
Crystal System	Orthorhombic
Mohs Scale	2-3
Specific Gravity	4.64
Color	steel grey
Streak	Dark brownish-grey.
Luster	Metallic
Diaphaneity	Opaque
Cleavage	Poor/IndistinctIndistinct prismatic.
Crystal Habit：Prismatic on, and striated parallel to . Prismatic to fibrous massive, plumose, radial; granular.
Geological Setting：Low temperature hydrothermal veins rich in antimony and deficient in sulfur

Berthierite is a mineral, a sulfide of iron and antimony with formula FeSb₂S₄. It is steel grey in colour with a metallic lustre which can be covered by an iridescent tarnish. Because of its appearance it is often mistaken for stibnite.

It was discovered in France in 1827 and named for the French chemist, Pierre Berthier.