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Mineral Specimen #4463    Quartz, Sphalerite, Calcite, Fluorite, Bitumen

Cave-In-Rock, Hardin Co., Illinois

Ex. A. Neely, 1960s

Three thin plates of Quartz which are apparently from the same pocket. The plates are only 2 to 3 mm in thickness; when back lit, light is transmitted through them. Sphalerite crystals can be found on both sides of the plates. The Sphalerite crystals exhibit a variety of habits some of which are unusual for the species and range from opaque and nearly black to reddish brown and gemmy. The Calcite crystals are off white in color, double terminated and with the exception of one larger crystal, quite small (2mm and under). The largest Calcite crystal is 16 cm long. The Calcite crystals are more abundant on one side of the plates. Two cubic Fluorite crystals are present which are unusually thin in width. The crystals are a pale purple and transparent. One of the Fluorite crystals is partially coated with hydrocarbons. In many ways, these specimens are unusual for the Cave-In-Rock Fluorite mines.

Condition: Very Good

Flaws: Some minor bruising on a few of the Sphalerite crystals.

7.9 x 6.5 x .5 and 5.8 x 4.7 x .7 and 6.1 x 4 x .8 cm

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This mineral is also found in the following galleries: Minerals From the United States | Quartz | Sulfides and Sulfosalts | Fluorite | Calcite | Minerals Priced Between 25 and 49 Dollars
This mineral is also found in the following galleries: Minerals From the United States | Quartz | Sulfides and Sulfosalts | Fluorite | Calcite | Minerals Priced Between 25 and 49 Dollars