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Mineralpedia Details for Nagyagite

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Nagyagite

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
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Nagyagite from Sacarîmb (Nagyag in Hungary), Romania

Nagyagite
            from Sacarîmb (Nagyag 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. 

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Nagyagite from Kasejovitz, Czech Republic

Nagyagite
            from Kasejovitz, Czech Republic

Two 1mm suspended crystals in Quartz. Originally from one Dr. Gerhard Jung.

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