Description

    QUARTZ PSEUDOMORPH after ANHYDRITE
    Ametista do Sul, Alto Uruguai Region, Rio Grande do Sul, Brazil

    Not all of the 'Amethyst' geodes mined near this little town have just Amethyst crystals in them. Some, like this one, originally contained fan-shaped aggregates of Anhydrite, the anhydrous version of Calcium Sulfate. A change in the neighborhood chemistry resulted in the Anhydrite being faithfully replaced by Quartz. This is where matters stood when the miners drilled into the "geode" containing this wonder. The tan pseudomorphs sprout from a thin, gray layer of Quartz, which was part of the wall of the geode before the miners separated the piece from the surrounding basalt flow. Some of the Quartz replacements show breakage of tips but it takes a while to figure out, just which ones. Condition is actually quite excellent: a tribute to the care taken when removing the piece.
    Overall measurements: 12 x 7 x 6 inches (30.5 x 17.8 x 15.2 cm).

    Provenance: Keith Proctor [Hoppel # D1810]


    Estimate: $8,500 - $9,500.

    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. 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
    October, 2013
    19th-20th Saturday-Sunday
    Bids + Registered Phone Bidders: 0
    Lot Tracking Activity: N/A
    Page Views: 455

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