Dims: 2.7 x 2.2 x 1.6" (6.9 x 5.6 x 4.1 cm)
Wt: 5.80 oz. (164.6 g)
Reynolds County, Missouri, U.S.A.
The gray limestone base of this hand specimen is mostly covered by hundreds of small Marcasite crystals. Though noticeable damage or breakage is present, most of these crystals are intact and in excellent condition. All have good orthorhombic prismatic form, and show the "cockscomb" formations that are a hallmark of this mineral (see the second image). These formations have well-defined edges and clean faces. All have the standard metallic luster of Marcasite and show colors that vary from a deep gold to a blue-green. The formations do not tend to exceed 0.4" (1.0 cm) in height, 0.7" (1.8 cm) in width, or 0.2" (5 mm) in thickness. Much of this Marcasite crust rests on crusts of small white dolomite crystals which in turn coat the gray base rock.