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Benitoite
Devoted to Benitoite, the state gem of California. Includes photographs, articles (including George D. Louderback's 1909 article "Benitoite, Its Paragenesis and Mode of Occurrence"), and topographical maps. From the Museum Informatics Project (MIP), University of California, Berkeley.
http://www.mip.berkeley.edu/geology/benitoite/

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