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Walter R. Kellogg


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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.

Condition: Good

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