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2. 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 ...

3. 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. Birthstones are often worn as jewelry or a pendant necklace. History of birthstones

4. 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.

5. Wikipedia:Userboxes/Seasonal/Birthdays/Symbols - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Userboxes/...

   This user's birthstones are Opal and/or Tourmaline: User: VonLumina ... This user's birthstones are Turquoise, Tanzanite and Zircon: Zodiacal Wikitext ...

6. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...

7. 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 ...