Berthierite

Berthierite
General
Category	Mineral
Formula (repeating unit)	FeSb2S4
IMA symbol	Btr[1] v
Strunz classification	2.HA.20
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pnam
Identification
Color	steel grey
Cleavage	poor/indistinct
Mohs scale hardness	2–3
Luster	metallic
Diaphaneity	opaque
Specific gravity	4.64

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).

See also

• List of minerals
• List of minerals named after people

References

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.

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