|Geological Benitoite Crystals with Neptunite on Nartolite 027069|| |
Rare Geological 'Benitoite Crystals with Neptunite' on Nartolite
Benitoite, 354 grams, 12 cm. Fine crystals of neptunite (black) and benitoite (blue) on natrolite, from the classic California, USA, locality, benitoite (ben-EE-toe-ite) is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color. The more rarely seen clear to white benitoite crystals fluoresce red under long-wave UV light. 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. Very fine condition, Rare. Provenance: ex Douglas Rose collection; formerly in the Christopher Cavey collection.