This Specimen has been sold.
3.5" Cubic Fluorite Crystals on Sphalerite - Elmwood Mine
This is a beautiful specimen of fluorescent, cubic fluorite crystals on a mass of metallic grey Sphalerite. The fluorite contains purple phantoms near the edges and is a faint green, within. There is some breakage to a few edges on the cubes. Comes with an acrylic display stand.
The Elmwood Mine is a zinc mine in Carthage, Tennessee which opened in 1969, before being closed for many years, only to be reopened in 2010. It has produced many world class specimens of Fluorite, Calcite, Barite and Galena over the years. Specimens used to be plentiful as miners were allowed to recover specimens, but collecting is strictly prohibited by the new mine owners. They've gone to great lengths to prevent the mining of specimens, including blasting crystal pockets or filling them with slurry.
Sphalerite is a part of the sulfides group and typically exhibits a grey/black appearance due to high concentrations of impurities. When sphalerite is in it's purest state, the chemical composition is ZnS, and can display a gemmy transparent light tan/yellow color. This is one of the few minerals that can form crystals ranging anywhere between gemmy and transparent to opaque and metallic-like. Opaque or cloudy sphalerite tends to be most abundant, due to the ease of iron replacing zinc in the process of formation.
Fluorite is a halide mineral comprised of calcium and fluorine, CaF2. The word fluorite is from the Latin fluo-, which means to flow. In 1852 fluorite gave its name to the phenomenon known as fluorescence, or the property of fluorite to glow a different color depending upon the bandwidth of the ultraviolet light it is exposed to. Fluorite occurs commonly in cubic, octahedral and dodecahedral crystals in many different colors. These colors range from colorless and completely transparent to yellow, green, blue, purple, pink or black. Purples and greens tend to be the most common colors seen.