Description

    LIMONITE on PYRITE
    Lake Monroe Spillway, Monroe Co., Indiana, USA

    Pyrite: the "Fools Gold" of numerous tales, is a changeable mineral. Pyrite can burn (causing mine fires), it can replace fossils, and finally Pyrite breaks down in water (but not quickly). It is the last of these actions that is responsible for the features of the specimen seen here. Both of the poly-crystalline Pyrite groups show a brown surface alteration to Limonite (Iron Hydroxide) caused by loss of Sulfur from contact with oxygenated ground water. This results in an exterior coating that retains the form of the Pyrite, but not the chemical identity. The matrix is an off-white limestone that commonly hosts Pyrite crystals in sedimentary deposits. The condition of both of the crystal groups is pristine with no damage.
    Overall measurements: 6 x 3 x 2 inches (15.2 x 7.6 x 5.1 cm). Offered at no reserve.

    Provenance: Williams Minerals [Hoppel Catalog # D0611]

    [Scale: 1 inch, with mark at 1 cm]


    Condition Report*:

    Condition report available upon request.

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    Auction Info

    Auction Dates
    June, 2013
    2nd Sunday
    Bids + Registered Phone Bidders: 3
    Lot Tracking Activity: N/A
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