Benitoite is a rare mineral found in very few locations including San Benito County, California, Japan and Arkansas.
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"' Benitoite "'( ) is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite.
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The Gem mine ( private ) located within the serpentine mass is the only source of gem-grade benitoite in the world.
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In addition to being one of the rarest minerals in the Benitoite Gem mine located in California, Jonesite also is the first titanosilicate mineral with a porous double-layered crystal structure.
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It was first described in 1907 by George D . Louderback, who named it " benitoite " for its occurrence near the headwaters of the San Benito River in San Benito County, California.
