I’ve posted a small group of great specimens from recent work at the famous Mundo Nuevo Mine in Peru on the website in this Mundo Nuevo Update (click here).
Mundo Nuevo is best known for its hubnerite, quartz, fluorite and augelite. However, in recent years there have been occasional excellent finds of tennantite and tetrahedrite. Specimens analyzed in prior years have had varying compsoitions of tetrahedrite-tennantite (depending on the As and Sb content) – many tennantite, some tetrahedrite and some have been called truly intermediate. These specimens, mined during recent specimen recovery efforts, were labelled tetrahedrite – I have not had them analyzed. They are excellent sharp crystals. After the crystals had formed, a late-stage fragmentation and recrystallization event seems to have occurred – the specimens have uneven naturally-fractured surfaces on the back/underside, and these surfaces are recrystallized.

Tetrahedrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 9.8 cm

Tetrahedrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 8.9 cm

Tetrahedrite with Sphalerite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – field of view 4.2 cm

Tetrahedrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – field of view 3.5 cm

Pyrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 6.7 cm

Tetrahedrite on Pyrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 5.6 cm

Tetrahedrite and Pyrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 7.0 cm

Tetrahedrite, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru – 8.1 cm

Tetrahedrite, Pyrite, Sphalerite and Quartz, Mundo Nuevo Mine, Huamachuco, La Libertad, Peru

Field of view 4.1 cm