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    opalized and pyritized ammonite fossil - one of my favorite of all mineral forms.. just glorious!

    Iridescent Ammonite fossil

    Moroccan Ammonite with a calcite replacement of its cellular structure and inlaid sections of synthetic Opal

    Detroit Agate / Fordite

    Opalized Ammonite

    pearls

    Ammonite

    Ammonite

    Spirals on abalone shells

    Rutilated Quartz, Brazil, #mineral

    Fluorite. Often called the most colorful mineral in the world. Gives its name to fluorescence, it absorbs then emits light. It is also thermoluminesent, it re-emits absorbed light when heated.

    Fire Opal / Mexico

    Chrysocolla with Quartz - Arizona

    Ammolite (Fossilized ammonite; the irridescent layer is very thin; found only in a small area in Canada)

    Marsdon Magna Marble -- Highly Polished, Embedded With UK Fossils Including British Ammonites -- Jurassic Period -- Approximately 200 MYO -- Fossils Direct

    Opalized ammonite fossil Wayne Lau Lau Lau Stratz

    Opalized fossil

    seashell

    Beautiful shell