Dims: 2.5 x 2.0 x 0.8" (6.4 x 5.1 x 2.0 cm)
Wt: 1.63 oz. (46.3 g)
Benitoite Mine, San Benito Co., California, U.S.A.
This specimen consists of at least 10 Neptunite crystals that rest on a pale gray host rock. Only 5 or 6 of them, however, are more than 50% complete, and at least 2 of these are visibly damaged. The largest is intact, measuring nearly 0.5" (1.3 cm) in length, and like most of the others, it has excellent monoclinic prismatic form, with well-defined edges and clean faces. All are colored black with subtle red-brown highlights and have a dull vitreous luster. They are accompanied by 3 small, incomplete benitoite crystals that are rather worn but still have reasonably good hexagonal form. Their luster is very dull due to wear, but their royal blue color is standard for their species, and they glow brightly under shortwave ultraviolet light. All rest on or around a crust of white, massive natrolite.