greenockite


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greenockite

[′grē·nə‚kīt]
(mineralogy)
CdS A green or orange mineral that crystallizes in the hexagonal system; occurs as an earthy encrustation and is dimorphous with hawleyite. Also known as cadmium blende; cadmium ocher; xanthochroite.
References in periodicals archive ?
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.
Despite this statement, greenockite is scarcely mentioned elsewhere in the literature.
Where greenockite occurs with smithsonite, it appears as the well-known yellow "turkey fat" variety.
According to Calderon (1910), the smithsonite of Andara is sometimes colored yellow by the presence of the small quantities of included greenockite.
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.
Greenockite occurs on fracture surfaces as small orange-yellow grains resembling orpiment, and within vugs as brilliant yellow acicular crystals to 0.