- Chalcopyrite, Dolomite, Sphalerite
- Joplin Field, Tri-State District, Jasper Co., Missouri, USA
- Large Cabinet, 24.2 x 16.9 x 6.8 cm
A very large and impressive example of a tri-state "classic" - sharp crystals of sphalerite to 1.5 cm (most are smaller) and tiny iridescent gold and purple crystals of chalcopyrite, isolated so that there is a nice contrast with the stark with dolomite matrix. This piece came out of the collection of Brent Lockhart, and the accompanying collection card shows him to have purchased it in 1969.