Franklin, Sussex Co, New Jersey
    Esperite is one formerly unique Franklin mineral that has always been coveted by collectors of fluorescents due to its shockingly brilliant yellowish-green response under shortwave ultraviolet. It has been found elsewhere in minor traces in a Bolivian tin mine, for example, but Franklin is likely the only locality deposit in any quantity. Though somewhat scarcer than Hardystonite, most collectors can hope to eventually obtain at least a small piece; but fine cabinet-sized and larger specimens are decidedly rare, and rich pieces such as this large 5 x 3 x 2½-inch cabinet specimen have always been extremely scarce and highly sought-after. Though this specimen represents the most typical association, with yellowish-green fluorescent willemite and the non-fluorescents black franklinite and orange zincite, the quality is exceptional. More mundane specimens of this association can be difficult to identify, as the fluorescent hues and intensities are similar enough that the colors appear indistinguishable as these two minerals become more intimately mixed. But the large, relatively pure vein-like bands of esperite are as bold and distinctive as the willemite, cutting a diagonal swathe across the beautiful rock, making for a rare, superb and highly aesthetic specimen of this Franklin classic.

    Provenance: Ex Hugh Ronemus Collection

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    Auction Dates
    June, 2011
    12th Sunday
    Bids + Registered Phone Bidders: 3
    Lot Tracking Activity: N/A
    Page Views: 1,116

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