Description
Willemite and Calcite UV Fluorescent Slab – Sterling Hill Mine, New Jersey, USA
This Willemite and Calcite slab is a genuine natural mineral specimen from the world-famous Sterling Hill Mine in New Jersey, USA, renowned for producing some of the finest fluorescent minerals globally. Carefully selected for its colour contrast and fluorescence potential, this slab offers both geological significance and strong visual appeal. The exact specimen shown in the photographs is the one you will receive.
Each piece includes a Certificate of Authenticity lifetime guarantee card, confirming it as a genuine specimen. Full sizing details are available in the listing images for accurate scale reference.
Mineral Composition and Crystal Species
This specimen features a classic association of Willemite and Calcite. Willemite is a zinc silicate mineral with the chemical formula Zn₂SiO₄, while Calcite is a calcium carbonate mineral (CaCO₃). Together, they form a well-known mineral pairing, particularly notable for their fluorescence under ultraviolet (UV) light.
Willemite typically occurs in massive, granular, or compact forms rather than well-defined crystals in this type of deposit. Calcite may appear as vein fillings or crystalline masses, often contrasting visually with the Willemite matrix.
Fluorescence and Visual Characteristics
One of the defining features of this specimen is its strong fluorescence under UV light. Willemite commonly fluoresces a bright green, while Calcite often displays shades of red, orange, or pink under shortwave ultraviolet light. This striking colour contrast makes specimens from Sterling Hill Mine highly sought after by collectors.
In normal lighting conditions, the slab may show earthy tones such as grey, brown, or off-white, with subtle variations in texture and pattern. Under UV light, however, the transformation reveals vivid colours that highlight the mineral distribution and internal structure.
The slab form allows for easy display and optimal viewing of both the natural matrix and fluorescent response.
Geological Formation and Sterling Hill Mine Origin
The Sterling Hill Mine is part of the Franklin-Sterling Hill zinc mining district, one of the most mineralogically diverse locations in the world. The deposit formed through complex metamorphic processes involving zinc-rich ore bodies that were subjected to high temperatures and pressures.
During metamorphism, original sedimentary deposits were transformed, resulting in the formation of minerals such as Willemite, Franklinite, and Calcite. The unique chemistry and geological history of this region contributed to the exceptional fluorescence seen in these minerals.
Specimens from this locality are internationally recognised and are highly collectible due to their rarity and scientific importance.
Structure, Texture and Display Appeal
• Flat slab format ideal for display and UV viewing
• Distinct mineral contrast between Willemite and Calcite
• Strong fluorescent response under ultraviolet light
• Highly collectible locality specimen
The natural texture of the slab reveals the geological layering and mineral distribution, providing both aesthetic and educational value. It is well suited for collectors, mineral displays, or anyone interested in fluorescent minerals.
Authenticity and Product Details
• Genuine Willemite and Calcite fluorescent slab
• From Sterling Hill Mine, New Jersey, USA
• Includes Certificate of Authenticity lifetime guarantee card
• Carefully selected individual specimen
• Exact piece shown in photos will be received
This Willemite and Calcite slab represents a unique combination of geological rarity, fluorescence, and collector appeal, making it a standout addition to any mineral collection or display.
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