- Greenockite, Sphalerite
- Miniature, 4.5 x 3.5 x 2.3 cm
- Joplin Field, Tri-State District, Jasper Co., Missouri, USA
Greenockite is an uncommon cadmium sulfide. Apple-green microcrystals of greenockite richly cover the hummocky matrix of sphalerite crystals on this fine, old-time specimen from the famous Joplin Field of the Tri-State District. Ex. Underhill and Feist Collections.