5.1" Calcite On Quartz & Sphalerite - Elmwood Mine

 
 
 
This is a beautiful, 5.1" wide specimen containing a sphalerite, quartz and calcite association, collected from the famous Elmwood mine in Tennessee. A sphalerite crystal cluster measuring 2.05" wide, can be found sitting atop a quartz encrusted matrix. On the opposite side of the specimen, an aggregation of gemmy, double twinned calcite crystals protrude from the rock matrix. This specimen comes with an acrylic display stand to assist with aesthetic presentation.

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.

Shalerite ((Zn,Fe)S) is a mineral that is the chief ore of zinc while Galena is a primary ore for lead.

Silicon Dioxide, also know as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form. Its fracture is conchoidal, but difficult to obtain.
DETAILS
SPECIES
Sphalerite, Quartz & Calcite
LOCATION
Elmwood Mine, Carthage, Tennessee
SIZE
Specimen is 5.1 x 4.5"
SUB CATEGORY
ITEM
#66313