Greenockite is widespread in small quantities as tiny pyramidal crystals, sometimes tightly grouped as thin crusts, and as rare twins.
Greenockite at Llallagua is widespread in small quantities, in all the veins but especially in the richer ore shoots where it coats marcasite and wavellite.
Wavellite coating quartz with a thin film of red greenockite and black sulfides came from the Reggis and Forastera veins below the sulfide horizon.
Aikinite Alabandite Ankerite Arsenopyrite Bournonite Djurleite Dolomite Emplectite Famatinite Greenockite
Gypsum Luzonite Marcasite Matildite Native arsenic Proustite Pyrrhotite (*)Siderite Stromeyerite (*)Vivianite
There is very little secondary mineralization, except for occasional coatings of greenockite. Department of the Interior reports for 1944 estimate that 35,000 tons of fluorite, sphalerite and galena have been removed from the property.
Greenockite is a rare mineral in the district, occurring as a greenish yellow to orange-yellow crust on sphalerite.
According to Calderon (1910), the smithsonite of Andara is sometimes colored yellow by the presence of the small quantities of included greenockite.
(All of these varieties, along with a lesser or greater proportion of hydrozincite and hemimorphite, are given the name "calamine" by the miners.) Smithsonite occurs here in a large number of colors, caused by the inclusion of small particles of copper carbonates, cinnabar, greenockite, iron oxides, etc.
The species is present most typically as very minute grains associated with pyrite, sphalerite, tetrahedrite, galena and greenockite. Examples from an exposure on the north side of the 5,050 bench have been found which consist of abundant, slightly corroded arsenopyrite crystals to 1 mm, both within matrix and as free-standing individuals in quartz-lined vugs.
An interesting occurrence at Gold Quarry is greenockite, locally in euhedral crystals.