Benitoite crystals with a small crystal of black neptunite from the Dallas Gem Mine, San Benito Coun

Benitoite crystals with a small crystal of black neptunite from the Dallas Gem Mine, San Benito County, California.  Benitoite was discovered in 1907 and is the State Gem of California.  It fluoresces a bright blue-white under short wave ultraviolet light.  According to www.minerals.net, “The crystal structure of Benitoite is unique, and is the only significant mineral in its crystal class. It crystallizes in a rare hexagonal sub-class called ditrigonal-dipyramidal.”  -- source link
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