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2. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

3. What is the birthstone for October? Hint: There's actually two.

   www.aol.com/birthstone-october-hint-theres...

   Opal is the traditional birthstone for October. It is believed the stone was discovered in India and given the name " upala ," or "precious stone" in Sanskrit, the Geological Institute of America ...

4. October - Wikipedia

   en.wikipedia.org/wiki/October

   The calendula An opal armband. Opal is the birthstone for October. Cut tourmaline. October's birthstones are the tourmaline and opal. [2] Its birth flower is the calendula. [3] The zodiac signs are Libra (until October 22) and Scorpio (from October 23 onward). [4] [5]

5. Opal (given name) - Wikipedia

   en.wikipedia.org/wiki/Opal_(given_name)

   Opal is a primarily feminine given name derived from the name of the gemstone opal. The gemstone is the birthstone for October. Its name is derived from the Sanskrit upala , which means 'jewel'. [1] It came into use along with other gemstone names during the late Victorian era.

6. Birthstone - Wikipedia

   en.wikipedia.org/wiki/Birthstone

   A birthstone is a gemstone that represents a person's birth period, usually the month or zodiac sign. ... Opal, one of two October birthstones. Tourmaline, ...

7. 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