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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Opal was rare and very valuable in antiquity. In Europe, it was a gem prized by royalty. [ 18 ] [ 19 ] Until the opening of vast deposits in Australia in the 19th century the only known source was Červenica beyond the Roman frontier in Slovakia . [ 20 ]

  3. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

  4. Petrified wood - Wikipedia

    en.wikipedia.org/wiki/Petrified_wood

    [1] [8] [9] Over time, almost all the original organic material is lost; only around 10% remains in the petrified wood. [2] [1] The remaining material is nearly pure silica, with only iron, aluminum, and alkali and alkaline earth elements present in more than trace amounts. Iron, calcium, aluminum are the most common, and one or more of these ...

  5. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.

  6. The world's most valuable gem is made of dinosaurs and ... - AOL

    www.aol.com/news/2015-08-12-the-worlds-most...

    Meet the extremely rare and psychedelic gem that will make all the others look boring as a Monday in your cubicle: And so are all the other precious stones compared to the most recent finding.

  7. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    A rock may consist of one type of mineral or may be an aggregate of two or more different types of minerals, spacially segregated into distinct phases. Some natural solid substances without a definite crystalline structure, such as opal or obsidian, are more properly called mineraloids. If a chemical compound occurs naturally with different ...

  8. Do NOT Do These 4 Things If You Find an Old Coin or Bill That ...

    www.aol.com/don-t-4-things-old-110036332.html

    Check Out: These 11 Rare Coins Sold for Over $1 Million For You: 3 Things You Must Do When Your Savings Reach $50,000 Of course, one of your first moves should be to find a reputable coin dealer ...

  9. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    At the time of the Exodus, the Bible states that the Israelites took gemstones with them (Book of Exodus, iii, 22; xii, 35–36). When they were settled in the Land of Israel , they obtained gemstones from the merchant caravans travelling from Babylonia or Persia to Egypt, and those from Saba and Raamah to Tyre ( Book of Ezekiel , xxvii, 22).

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