Mineral Specimen #6191 Twinned Calcite with Minor Included Polydymite
Gray Quarry, Hamilton, Hancock Co., Illinois
7.3 x 4.4 x 3.3 cm
A cluster of well formed twinned Calcite crystals which are clear to white in color and for the mist part transparent. The srifaces are striated and have a high luster. There are a few inclusions of the rare nickel sulfide, Polydymite, which is closely related to Millerite. The Polydymite is present encased in the Calcite as dark colored, fibrous crystals. The Calcite crystals have a glossy luster and are striated.
Flaws: There is some minor chipping on some of the edges of the crystals.
This mineral is also found in the following galleries: Minerals From the United States | Calcite | Sulfides and Sulfosalts | Rare Minerals | Pseudomorphs | Minerals Priced Between 25 and 49 Dollars