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    Description

    SMITHSONITE
    Berg Aukas, Grootfontein District, Otjozondjupa Region, Namibia

    The largest and most perfect Smithsonite specimens known have come from the mines of north central Namibia, specifically those of Tsumeb and Berg Aukas. Here, sinkholes and caverns in the limestone have been invaded and mineralized by metal bearing fluids from below, exposing ore bodies that subsequently weathered, leaving crystalline deposits of metallic compounds. In the case of Berg Aukas, these were chiefly: Lead, Zinc and Vanadium. Reactions between the limestone host rock and Zinc bearing water produced giant and exceptionally perfect Smithsonite crystal groups, one of which is seen here. It is composed of a large number of tan Smithsonite crystals of considerable size, some up to 1 ΒΌ inches (3.2 cm) from end to end. The cores of the tan groups are also Smithsonite, but of a dark gray color. This material makes up most of the dark matrix of the piece. On the backside is a white, crustiform patch of Willemite: Zinc Silicate, which fluoresces under SW Ultra-Violet light. The group is in excellent to pristine condition. The mine is no longer in production, so available material is all coming from existing collections.
    Overall Measurements: 6.02 x 3.34 x 2.74 inches (15.3 x 8.5 x 6.97 cm)
    Offered at no reserve.

    Provenance: Minerals America [Hoppel #D2166]


    Estimate: $10,000 - $12,000.

    Condition Report*: Condition report available upon request.
    *Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Some condition issues may not be noted in the condition report but are apparent in the provided photos which are considered part of the condition report. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.

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    Auction Info

    Auction Dates
    May, 2014
    4th Sunday
    Bids + Registered Phone Bidders: 0
    Lot Tracking Activity: N/A
    Page Views: 397

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