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berthierite

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Berthierite is a mineral, a sulfide of iron and antimony with formula . It is steel grey in colour with a metallic lustre, which an iridescent tarnish can cover. Because of its appearance, it is often mistaken for stibnite (, an antimony trisulfide mineral, free of sulfide).

Key facts

Mineral.class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Mineral.name
Berthierite
Mineral.image
Berthierite-224182.jpg
Mineral.IMAsymbol
Btr
Mineral.strunz
2.HA.20
Mineral.system
Orthorhombic
Mineral.symmetry
Pnam
Mineral.color
Steel grey
Mineral.cleavage
Poor/indistinct
Mineral.mohs
2–3
Mineral.luster
Metallic
Mineral.diaphaneity
Opaque
Mineral.gravity
4.64

via Wikipedia infobox

~1 min read

Encyclopedic overview

3 sections
Contents
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  • References
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Berthierite is a mineral, a sulfide of iron and antimony with formula . It is steel grey in colour with a metallic lustre, which an iridescent tarnish can cover. Because of its appearance, it is often mistaken for stibnite (, an antimony trisulfide mineral, free of sulfide).

It was discovered in France in 1827 and named for the French chemist, Pierre Berthier (1782–1861).

Excerpted from Wikipedia’s “berthierite” article, available under the CC BY-SA 4.0 licence.