Mineral Specimen #4382 Aragonite on Sphalerite with Minor Fluorite
Hardin Co., Illinois
4 x 4.1 x 3.1 cm
1.6 x 1.6 x 1.2 in
Ex. A. Neely, 1960s
White, crudely formed, aggregates of Aragonite crystals have grown on the terminations of Sphalerite crystals which are a dark brown almost black color with reddish highlights. There is a very unusual, oval shaped cast in the Sphalerite on the back side of the specimen. The Aragonite has no luster but the Sphalerite has a nice glossy almost greasy looking luster. The oval cast has a very high luster. Aragonite specimens from Hardin County are not common and are seldom available.
Flaws: The Sphalerite is cleaved below the Argonite on the side with the unusual cast.
This mineral is also found in the following galleries: Minerals From the United States | Carbonates | Sulfides and Sulfosalts | Fluorite | Minerals Priced Between 25 and 49 Dollars