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    Description

    AN OUTSTANDING PRECIOUS GEM AMMONITE
    Placenticeras meeki
    Upper Cretaceous
    Bearpaw formation, Alberta, Canada

    Most ammonites from this area are found to be best left in their matrix, but occasionally one will be extracted from the gray shale rock intact, shimmering all over with rare iridescent gem ammolite. This is an attractive example, shimmering with green, red and gold, and where the ammolite is lacking, the deep warm brown beneath provides a suitably complementary ground.
    The clay-like, aluminum-rich sediment that covered these ammonites for millions of years stretch over areas of Montana, Albert and Saskatchewan, prevented them from turning to calcite; instead, the aragonite in their nacreous shells was tainted with impurities and trace elements such as manganese, strontium and titanium and manifested themselves into the dazzling colors seen here.
    It measures 10 inches in diameter and is a hefty 2 inches thick.




    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.

    Auction Info

    Auction Dates
    June, 2008
    8th Sunday
    Bids + Registered Phone Bidders: 6
    Lot Tracking Activity: N/A
    Page Views: 1,492

    Buyer's Premium per Lot:
    19.5% of the successful bid (minimum $9) per lot.

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