Embedded in the pure white natrolite are the sapphire blue benitoite and the black prismatic crystals of neptunite. The assemblage is a classic among collectors and specimens with all three minerals are much sought after. Neptunite is named after the Roman god of the sea, Neptune. Crystals are well formed and typically show multiple secondary faces. The flashes of red that appear to come right from the center of the crystal are a nice added touch to this rare and interesting mineral.
Color is black to reddish black.
Luster is vitreous. Transparency crystals are translucent to opaque. The terminations are modified and slanted dome faces. Also found massive and in disseminated grains. Cleavage is perfect in two direction at 80 and 100 degree angles.