Dims: 6.0" x 3.5" x 2.2" (15.2 x 8.9 x 5.6 cm)
Wt: 2 lbs., 12.8 oz. (1.271 g.)
Amax Mine, Reynolds County, Missouri, U.S.A.
This massive specimen consists of a formation that is made mostly of intergrown pseudocubic Marcasite crystals. They are generally in excellent condition, showing very little damage. Their form is reasonably good, though individual crystals are difficult to isolate due to the intense intergrowth. However, some do appear to exceed 1" (2.5 cm) along an edge. Their color is a deep, dull gold, and they have a metallic luster that is slightly duller than that of pyrite. The underside of the specimen shows many small, intergrown cubic galena crystals and hundreds of tiny rhombohedral calcite crystals. A small amount of rust-staining on the bottom shows evidence of the breakdown of the Marcasite through its production of sulfuric acid, but it seems to be confined. It is one of the larger Marcasite specimens that we have available.