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  2. Birthstone - Wikipedia

    en.wikipedia.org/wiki/Birthstone

    Garnet, the birthstone for January. Amethyst, the birthstone for February. Aquamarine, the birthstone for March. Diamond, the birthstone for April. Emerald, the birthstone for May. Pearl, one of three June birthstones. Moonstone, one of three June birthstones. Alexandrite, one of three June birthstones.

  3. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Download as PDF; Printable version; In other projects ... There are over 300 types of minerals that have been used as gemstones. Such as: ... Eilat stone; Epidosite ...

  4. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    Peridot. Peridot ( / ˈpɛrɪˌdɒt, - ˌdoʊ / PERR-ih-dot, -⁠⁠doh ), sometimes called chrysolite, is a yellowish-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle.

  5. Georgia Guidestones - Wikipedia

    en.wikipedia.org/wiki/Georgia_Guidestones

    March 22, 1980. ( 1980-03-22) Dismantled date. July 6, 2022. The Georgia Guidestones was a granite monument that stood in Elbert County, Georgia, United States, from 1980 to 2022. It was 19 feet 3 inches (5.87 m) tall and made from six granite slabs weighing a total of 237,746 pounds (107,840 kg). [ 1] The structure was sometimes referred to as ...

  6. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Claystone – Clastic sedimentary rock composed primarily of clay-sized particles. Coal – Combustible sedimentary rock composed primarily of carbon. Conglomerate – Sedimentary rock composed of smaller rock fragments. Coquina – Sedimentary rock that is composed mostly of fragments of shells.

  7. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a gemstone. In cut and polished form, it is used to make jewelry or other adornments. Lower quality topaz is commonly used as an abrasive material due to its hardness and it is used to produce refractory materials for high temperature environments. [ 7] Topaz can be used as a flux in steel production. [ 23]

  8. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, it occurs in other colors, including gray and black, and also can be colorless. A pinkish orange variety of sapphire is called padparadscha .

  9. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

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