Dims: 4.1 x 2.1 x 1.2" (10.5 x 5.2 x 3.1 cm)
Wt: 7.8 oz. (220 g)
Reynolds County, Missouri, U.S.A.
The limestone base of this specimen is coated with Sphalerite crystals over more than 50% of its surface area. Most of these crystals do not exceed 0.1" (3 mm) in diameter, but several are very large, exceeding 0.8" (2 cm) along an axis. They are generally in very good condition, and their warped tetrahedral form is quite good for their locality- some definite twinning (some of which is Spinel-Law) is also visible. All have the dark, black-brown color of their species and a bright, greasy luster. A few bits of broken calcite are also present.