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    Description

    FINE DOUBLE AMMONITE WALL PLAQUE
    Placenticeras meeki
    Cretaceous
    Bearpaw Formation, Southern Alberta, Canada

    Gem ammolite ammonites are amongst the most sought-after of all fossils, and here are not one but two examples. In most localities the aragonite-rich nacre (mother-of-pearl) of the ammonite's shell is pseudomorphously replaced by calcite or pyrite, but in the small Bearpaw formation, stretching over parts of Montana, Alberta and Saskatchewan along the eastern slopes of the Rocky Mountains, the ammonite's shell becomes tainted with trace elements such as manganese, strontium, titanium, barium and others, manifested in the dazzling colors displayed here. The resulting gemstone is called ammolite, and it has long been believed by the local Blackfeet Indians of Montana and the Káínawa of southern Alberta to have amuletic powers of use in healing and in attracting buffalo. Practitioners of feng shui and crystal metaphysics value it as the Kirin stone or seven-color prosperity stone, and believe it to be useful in detoxifying the body and promoting energy flow and prosperity. In 1981 it was accorded gemstone status by the World Jewelry Confederation; it is one of several biogenic gemstones, like amber and pearl, and can be grouped with other shell-based marbles such as lumachella, or "fire marble", formed from the fossilized shells of clams or snails. The present specimens are particularly fine for not only do they flash with the familiar golden green color; they also display an equal amount of the much rarer purple and blue coloring. Stunning examples, they measure 9¼ and 6 1/8 inches in diameter, perfectly offset by the gray shale matrix that measures 30 x 27 inches and is ready for wall-hanging.


    Estimate: $24,000 - $30,000.

    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
    January, 2010
    17th Sunday
    Bids + Registered Phone Bidders: 0
    Lot Tracking Activity: N/A
    Page Views: 832

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