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  2. 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 ...

  3. California State Mining and Mineral Museum - Wikipedia

    en.wikipedia.org/wiki/California_State_Mining...

    Exhibits include the crystalline gold Fricot Nugget, weighing 201 troy ounces (6.25 kg), the largest found during the California Gold Rush; a working scale model of a stamp mill over 100 years old, demonstrating the process of extracting gold from quartz rock; and a replica hard rock mine tunnel that allows visitors to better understand California's hard rock mines.

  4. Benitoite - Wikipedia

    en.wikipedia.org/wiki/Benitoite

    Benitoite is a rare mineral found in very few locations including San Benito County, California, Japan and Arkansas. In the San Benito occurrence, it is found in natrolite veins within glaucophane schist within a serpentinite body. In Japan, the mineral occurs in a magnesio-riebeckite-quartz-phlogopite-albite dike cutting a serpentinite body. [5]

  5. 18 Most Expensive Gemstones in the World - AOL

    www.aol.com/18-most-expensive-gemstones-world...

    Benitoite is almost exclusively found in California's San Benito County, when it is found at all. ©Shutterstock.com. 10. Tritium ... Grandidierite is a gemstone that is a close cousin to ...

  6. San Benito Mountain - Wikipedia

    en.wikipedia.org/wiki/San_Benito_Mountain

    Hobby gem and mineral collectors are drawn to the Clear Creek area, one of the most highly mineralized areas in California, by the presence of over 150 semi-precious minerals and gemstones. Among these are serpentine, jadeite, cinnabar, tremolite, topazite, neptunite, and the extremely rare California state gem, benitoite.

  7. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    The Empress Dowager Cixi of China loved pink tourmaline and bought large quantities for gemstones and carvings from the then new Himalaya Mine, located in San Diego County, California. [26] It is not clear when the first tourmaline was found in California. Native Americans have used pink and green tourmaline as funeral gifts for centuries.

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