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  2. Shell tools in the Philippines - Wikipedia

    en.wikipedia.org/wiki/Shell_tools_in_the_Philippines

    Duyong Cave, near the Tabon Caves of Palawan's western coast (Philippines) produced a "Neolithic Burial" with four Tridacna shell adzes and two different types of shell ornaments as well as other types of shell tools. The calibrated Carbon 14 date for the burial is 3,675 - 3,015 B.C. and 4,575 - 4,425 B.C. for a nearby fire hearth that also had ...

  3. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    An amethyst geode that formed when large crystals grew in open spaces inside the rock. The largest amethyst geode found as of 2007 was the Empress of Uruguay, found in Artigas, Uruguay in 2007. It stands at a height of 3.27 meters, lies open along its length, and weighs 2.5 tons. Amethyst is also found and mined in South Korea. [19]

  4. Grey-breasted brown dove - Wikipedia

    en.wikipedia.org/wiki/Grey-breasted_brown_dove

    The grey-breasted brown dove (Phapitreron amethystinus maculipectus) is a subspecies of amethyst brown dove in the family Columbidae. It is endemic to the Philippines being found in Negros and Panay. Its natural habitats are or tropical moist lowland forests and tropical moist montane forests.

  5. Pearl - Wikipedia

    en.wikipedia.org/wiki/Pearl

    Natural (or wild) pearls, formed without human intervention, are very rare. Many hundreds of pearl oysters or mussels must be gathered and opened, and thus killed, to find even one wild pearl; for many centuries, this was the only way pearls were obtained, and why pearls fetched such extraordinary prices in the past.

  6. List of diamonds - Wikipedia

    en.wikipedia.org/wiki/List_of_diamonds

    a 100.10-carat (20.020 g) pear-shaped D-color, Internally Flawless stone. At $16,548,750 US in 1995 it held the world record for the highest price paid for a diamond at auction until the sale of the Wittelsbach-Graff diamond in 2008. [58] —

  7. Empress of Uruguay - Wikipedia

    en.wikipedia.org/wiki/Empress_of_Uruguay

    The Empress of Uruguay is the world's largest amethyst geode, standing at a height of 3.27 meters. It is open along its length and weighs 2.5 tons in its current state. It was discovered in 2007 in the Artigas department, Uruguay by the Uruguayan mining company Le Stage Minerals.

  8. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]

  9. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    A family listening to a crystal radio in the 1920s Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram US Bureau of Standards 1922 Circular 120 "A simple homemade radio receiving outfit" taught Americans how to build a crystal radio.

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