DescriptionSUPERB FLUORESCENT WILLEMITE CRYSTAL IN CALCITE
430' Level, Sterling Hill Mine, Ogdensburg, Sussex Co, New Jersey
While Willemite is an abundant ore mineral in the Franklin area mines, sizable Willemite crystals are extremely rare. Most of the crystals that are found tend to have a rounded or corroded appearance, making this 1½-inch (3.8 cm) crystal, with razor-sharp edges, an outstanding rarity. Although at first glance it appears to be a single reddish-brown crystal, it is actually a step-growth group of crystals; one of the major hexagonal prism faces shows some 'hopper' growth along with a couple of its corners. The dominant feature of the crystal however, is its extreme sharpness. Securely emplaced in the center of the white Calcite pocket, along with some blebs of black Franklinite and red-brown Willemite, it is an intriguing enough piece under normal light. Its real value is revealed under shortwave ultraviolet light: all of the Willemite fluoresces a brilliant green color, including several spidery veins coursing through the Calcite; while the Calcite fluoresces a blazing orange-red, dramatically speckled with black patches of Franklinite. The Willemite crystal retains its sharpness even under ultraviolet, and makes this a first-class, museum-standard specimen. 4¼ x 3½ x 2½ inches (10.8 x 8.9 x 6.4 cm).
Provenance: ex. Hugh Ronemus Collection
Condition report available upon request.
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