Berthierite

Berthierite
General
CategoryMineral
Formula
(repeating unit)
FeSb2S4
IMA symbolBtr[1] v
Strunz classification2.HA.20
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnam
Identification
Colorsteel grey
Cleavagepoor/indistinct
Mohs scale hardness2–3
Lustermetallic
Diaphaneityopaque
Specific gravity4.64

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 (1782–1861).

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.