Nagyágite
A variety of Minerals
What is Nagyágite?
Nagyágite (Pb5Au(Te,Sb)4S5-8) is a rare sulfide mineral with known occurrence associated with gold ores. Nagyágite crystals are opaque, monoclinic and dark grey to black coloured. It was first described in 1845 for an occurrence at the type locality of the Nagyág mine, Săcărâmb, Hunedoara County, Romania. It occurs in gold–tellurium epithermal hydrothermal veins. Minerals associated with nagyágite include: altaite, petzite, stutzite, sylvanite, tellurantimony, coloradoite, krennerite, native arsenic, native gold, proustite, rhodochrosite, arsenopyrite, sphalerite, tetrahedrite, calaverite, tellurobismuthite, galena and pyrite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Nagyágite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Nagyágite Localities Map
See where Nagyágite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Black-grey
- Hardness (Mohs)
- 1 - 1.5
- Density
- 7.29 g/cm³
- Streak
- Blackish lead-grey
Chemical Properties
- Chemical Formula
- Pb3(Pb,Sb)3S63
- Elements
- Au, Pb, S, Sb, Te
Also Known As
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Nagyágite FAQs
How do I identify Nagyágite?
Nagyágite can be identified by its hardness of 1 - 1.5 on the Mohs scale, Black-grey color. Look for these key characteristics when examining specimens.
What color is Nagyágite?
Nagyágite typically appears in Black-grey. Color can vary depending on impurities and formation conditions.
How hard is Nagyágite?
Nagyágite has a hardness of 1 - 1.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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