Mineralpedia Details for Nagyagite

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Nagyagite

More appropriately spelled Nagyágite, this mineral gets its name from the type locality at Sacarîmb, also called Nagyág, in Romania. Nagyagite is an uncommon mineral that occurs in epithermal hydrothermal gold and tellurium bearing deposits. It can be found in, additionally, the Czech Republic, Kazakhstan, Armenia, Zimbabwe, the United States, Canada, Argentina, Australia, New Zealand, Japan, and Fiji among others. Nagyagite has a hardness of 1.5 on the Mohs scale with thin flexible lamellae much like Molybdenite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/nagyagite.pdf

Formula: [Pb(Pb,Sb)S₂][(Au,Te)]
Crystal System: Tetragonal
Crystal Habit: Granular, Lamellar, Platy
Cleavage: Perfect, None, None
Luster: Metallic
Color: lead gray, black
Streak: gray black
Class: Tetragonal - Disphenoidal
Fracture: Hackly
Hardness: 1.5-2
WebMineral: View Nagyagite
Mindat: View Nagyagite

Nagyagite from Săcărâmb (Nagyág in Hungary), Romania

Special Info: Type Locality

Numerous silvery lead-grey somewhat foliated metallic plates to 7mm. There are SIX large plates from 5 to 7mm with numerous smaller plates throughout the specimen. As is typical of specimens from Nagyag, Rhodochrosite covers much of the crystals. Fortunately on this specimen alot of the crystals were not encrusted over by the Rhodochrosite. Cross twinned lamellae can be seen on the crystals. Nagyagite is a soft mineral (1.5 Mohs) with thin foliations much like Molybdenite.

This mineral gets its name from the type locality at Sacarîmb, also called Nagyág, in Romania. Nagyagite is an uncommon mineral that occurs in epithermal hydrothermal gold and tellurium bearing deposits. It can be found additionally in the Czech Republic, Kazakhstan, Armenia, Zimbabwe, the United States, Canada, Argentina, Australia, New Zealand, Japan, and Fiji among others. Although most other localities rarely surface on the market. Nagyag is the undoubtedly the best and most desirable and sought after. Even on Mindat, there are no other localities photographed. In our MineralPedia, we have the Czech Locality at Kasejovitz photographed.