How do I identify Guettardite?

Guettardite can be identified by its hardness of 4 on the Mohs scale, Greyish black color. Look for these key characteristics when examining specimens.

What color is Guettardite?

Guettardite typically appears in Greyish black. Color can vary depending on impurities and formation conditions.

How hard is Guettardite?

Guettardite has a hardness of 4 on the Mohs scale. This gives it moderate hardness.

Guettardite

A variety of Minerals

What is Guettardite?

Guettardite is a rare arsenic-antimony lead sulfosalt mineral with the chemical formula Pb(Sb,As)2S4. It forms gray black metallic prismatic to acicular crystals with monoclinic symmetry. It is a dimorph of the triclinic twinnite.

Guettardite Market Value Calculator

Estimate the market value of Guettardite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Guettardite Localities Map

See where Guettardite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

Key Characteristics

Formation of Guettardite

It was first described in 1967 for an occurrence in the Taylor Pit, Madoc, Hastings County, Ontario, Canada. It was named for French naturalist Jean-Étienne Guettard (1715–1786). It occurs in hydrothermal veins within marble at the type locality in Modoc. It occurs associated with pyrite, sphalerite, wurtzite, galena, stibnite, orpiment, realgar, enargite, tetrahedrite, zinkenite, jordanite, bournonite, sterryite, boulangerite, jamesonite and sartorite at Madoc. In addition to the type locality, it has been reported from the Brobdingnag mine, near Silverton, Colorado; the Jas Roux deposit in Hautes-Alpes, France; from various marble quarries near Seravezza, Tuscany, Italy; a marble quarry in Valais, Switzerland and from Khaydarkan, Fergana Valley, Alai Mountains, Kyrgyzstan.