Mineral Specimen #5331 Hexagonal Calcite partially Pseudomorphed to Malachite on Chalcopyrite Pseudomorph Casts after Galena
Sweetwater Mine, Viburnum Trend Dist., Reynolds Co., Missouri
3.6 x 3 x 3.1 cm
This specimen exhibits two types of pseudomorphs. The base is composed of small Chalcopyrite crystals which formed over Galena crystals. The Galena crystals are no longer extant leaving a cast. Some of the Calcite has partially altered to Malachite due to substitution of calcium with copper with the Chalcopyrite being the probable source of the copper.
Flaws: Two of the side faces of the largest crystal show extensive contact surfaces (see the 4th picture).
This mineral is also found in the following galleries: Minerals From the United States | Calcite | Sulfides and Sulfosalts | Carbonates | Pseudomorphs | Minerals Priced Between 25 and 49 Dollars