Nā Pōhaku Lāʻau | Benitoite: The Rarest Gemstone Found Only in California 

Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. Beniotite is a very rare mineral that was discovered in 1907 in San Benito County in California.  […]

Read more at  … http://www.geologyin.com/2018/03/benitoite-rarest-gemstone-found-only-in.html#hJCkaxXPjb3IYG58.99

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