An excellent specimen of lustrous black prismatic crystals of Neptunite measuring to 3.7cm finely contrasted on the white Natrolite matrix. Two cornflower millimetre sized Benitoite crystals protrude through the white Natrolite at one end of the specimen. On the typical pale grey-blue matrix from the Benitoite Gem Mine, California.

Origin: Benitoite Gem Mine, New Idria District, Diablo Range, San Benito Co., California, USA