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    Geology

    "Stones!" *cough* I mean, the beauty of geology... Gems, Minerals, Fossils. Also cuts & colours.
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    Plate from Françoise Louis Swebach Desfontaines' 'Histoire naturelle' (1789). Natural History Museum, London

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    Opal Colourations

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    joias6.tumblr.com

    Malachite - $200 LEtoile du Congo Mine, Lubumbashi, Katanga Copper Crescent, Democratic Republic of the Congo

    Fine Collector Mineral Specimens - Andy Seibel

    andyseibel.com

    Malachite Stalactite Slice Handcrafted Sterling Silver Pendant

    Malachite Stalactite Slice Handcrafted Sterling Silver Pendant

    crystalarium.com

    Azurite and Malachite Natural Crystal Sphere - Argentina

    Azurite and Malachite Natural Crystal Sphere - Argentina

    crystalarium.com

    Malachite with (originally: www.crystalarium...., now 404)

    Malachite with Chrysocolla - partially polished Stalactite / Congo

    wefollowpics.com

    Smithsonian Institute Global Volcanism Program

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    volcano.si.edu

    V některých částech dolu se stále ještě těží. Foto, ilustrace: Profimedia

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    Quartz with blue fluorite inclusions.

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    Ethiopian kryptonite (opal) | via Jeff Schultz on Flickr

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    Fossilised teeth | via Jeff Schultz on Flickr

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    Gallium: A metal with a melting point of a little over 27 degrees centigrade. Meaning it melts from solid state to liquid state in your hand

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    Fire Opal in matrix, Mexico | via Jeff Schultz on Flickr

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    Helpful gem chart

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    Amethyst Crystal Ball

    2.4" Amethyst Geode Sphere, Crystal Ball

    rikoo.com

    Boulder Opal

    Blog - Laura Preshong Jewelry

    ganoksin.com

    Veszelyite. One of the minerals called phosphates. All phosphates have the phosphate group, PO4, in their chemical composition. Many phosphates form from the chemical alteration of other minerals in the presence of oxygen. Group: Phosphates. Image Number: 97-35129. Catalog Number: 148368. M. Stuart

    The Dynamic Earth @ National Museum of Natural History

    mnh.si.edu

    Smithsonite. The mineral was named after James Smithson, the British chemist and mineralogist who first recognized it as a distinct mineral, different from calamine(hemimorphite). It is mined for zinc. James Smithson (1754-1829) was the founder of the Smithsonian Institution. Group: Carbonates, Image Number: MSA 62

    The Dynamic Earth @ National Museum of Natural History

    mnh.si.edu

    Liddicoatite. Slice from a single crystal of liddicoatite. The colour-zoning reveal the crystal's history, just as the rings in a tree records its past. Crystals may start and stop growing many times. In most cases, there is no way of knowing how long each phase lasted. This particular crystal changed color as it grew. The pink portion of the liddicoatite formed when the solution feeding it was manganese rich. The green part grew when the solution became iron rich.

    The Dynamic Earth @ National Museum of Natural History

    mnh.si.edu

    Rare Nipomo marcasite in agate, from California.

    NIPOMO MARCASITE designer cab Silverhawk's designer gemstones.

    samsilverhawk.com

    Deschutes jasper

    DESCHUTES JASPER designer cab Silverhawk's designer gemstones.

    samsilverhawk.com

    Ethiopian Welo opal beads, about 100 carats. The largest beads are about 10 mm diameter. | via James Picht on Flickr

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    Lapis Lazuli & Pyrite | via Maryanne Fender on Flickr

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    Azurite & Malachite Cabochon | via Maryanne Fender on Flickr

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    Malachite Round Cabochon | via Maryanne Fender on Flickr

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