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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.
Shalerite ((Zn,Fe)S) is a mineral that is the chief ore of zinc while Galena is a primary ore for lead.
The Elmwood Mine
The Elmwood Mine in central Tennessee is one of the world’s premier localities for fluorite, barite, and sphalerite, producing specimens renowned for their size, color, and exceptional crystal quality. Forming within Mississippi Valley–Type (MVT) deposits, Elmwood fluorite is famous for its rich grape-purple cubes—often water-clear and stepped—with barite perched elegantly on top in creamy clusters or golden blades. The mine’s sphalerite is equally celebrated, yielding lustrous, gemmy crystals ranging from fiery orange to deep red-black. Together, these species make Elmwood one of the most iconic and collectible mineral localities on the planet, known for generating museum-grade combinations unmatched in aesthetics and mineralogical significance.
Commercial mining at Elmwood began in the late 1960s, when the site was developed as part of the larger Central Tennessee zinc district. For decades, the mine operated primarily as a major source of high-grade zinc ore for industrial use, with fluorite, barite, and collector-quality sphalerite crystals forming as spectacular but incidental byproducts of the ore-extraction process. Periodic closures and reopenings—driven by fluctuating zinc prices and ownership changes—have made fine Elmwood specimens increasingly coveted over time. Although the mine’s primary purpose was always zinc production, its unexpected yield of world-class mineral specimens has cemented Elmwood’s place as one of the most important and beloved mineral localities in North America.
The Elmwood Mine in central Tennessee is one of the world’s premier localities for fluorite, barite, and sphalerite, producing specimens renowned for their size, color, and exceptional crystal quality. Forming within Mississippi Valley–Type (MVT) deposits, Elmwood fluorite is famous for its rich grape-purple cubes—often water-clear and stepped—with barite perched elegantly on top in creamy clusters or golden blades. The mine’s sphalerite is equally celebrated, yielding lustrous, gemmy crystals ranging from fiery orange to deep red-black. Together, these species make Elmwood one of the most iconic and collectible mineral localities on the planet, known for generating museum-grade combinations unmatched in aesthetics and mineralogical significance.
Commercial mining at Elmwood began in the late 1960s, when the site was developed as part of the larger Central Tennessee zinc district. For decades, the mine operated primarily as a major source of high-grade zinc ore for industrial use, with fluorite, barite, and collector-quality sphalerite crystals forming as spectacular but incidental byproducts of the ore-extraction process. Periodic closures and reopenings—driven by fluctuating zinc prices and ownership changes—have made fine Elmwood specimens increasingly coveted over time. Although the mine’s primary purpose was always zinc production, its unexpected yield of world-class mineral specimens has cemented Elmwood’s place as one of the most important and beloved mineral localities in North America.
Shalerite ((Zn,Fe)S) is a mineral that is the chief ore of zinc while Galena is a primary ore for lead.
About Quartz
Quartz is the name given to silicon dioxide (SiO2) and is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich environments--usually igneous rocks or hydrothermal environments like geothermal waters--at temperatures between 100°C and 450°C, and usually under very high pressure. In either case, crystals will precipitate as temperatures cool, just as ice gradually forms when water freezes. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountain formation: these veins can be hundreds of millions of years old.
Quartz is the name given to silicon dioxide (SiO2) and is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich environments--usually igneous rocks or hydrothermal environments like geothermal waters--at temperatures between 100°C and 450°C, and usually under very high pressure. In either case, crystals will precipitate as temperatures cool, just as ice gradually forms when water freezes. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountain formation: these veins can be hundreds of millions of years old.
About Calcite Crystals
Calcite crystals are a form of calcium carbonate (CaCO₃) known for their diverse shapes, transparency, and vibrant range of colors. They typically form in rhombohedral, scalenohedral, or prismatic shapes, often with well-defined, sharp edges and glossy surfaces. Calcite crystals are often translucent or transparent, sometimes displaying a double refraction effect where objects viewed through the crystal appear doubled. They can appear in various colors—white, clear, yellow, pink, blue, green, and orange—depending on impurities or trace minerals.
A notable characteristic of calcite is its reaction with weak acids like vinegar, which causes it to effervesce, or fizz, as it releases carbon dioxide. This property makes calcite crystals a key tool in geological identification and studies. Calcite forms in many environments, from sedimentary rocks like limestone and marble to hydrothermal veins.
Calcite crystals are a form of calcium carbonate (CaCO₃) known for their diverse shapes, transparency, and vibrant range of colors. They typically form in rhombohedral, scalenohedral, or prismatic shapes, often with well-defined, sharp edges and glossy surfaces. Calcite crystals are often translucent or transparent, sometimes displaying a double refraction effect where objects viewed through the crystal appear doubled. They can appear in various colors—white, clear, yellow, pink, blue, green, and orange—depending on impurities or trace minerals.
A notable characteristic of calcite is its reaction with weak acids like vinegar, which causes it to effervesce, or fizz, as it releases carbon dioxide. This property makes calcite crystals a key tool in geological identification and studies. Calcite forms in many environments, from sedimentary rocks like limestone and marble to hydrothermal veins.
SPECIES
Sphalerite, Quartz & Calcite
LOCATION
Elmwood Mine, Carthage, Tennessee
SIZE
Specimen is 5.1 x 4.5"
CATEGORY
ITEM
#66313
