In 2018, a new type of nephrite jade was recognised from the DJ project in Washington State (USA) that exhibits subtle-to-strong directional colour variations when viewed at different orientations. Its colouration ranges from green to blue in light-to-dark tones, and its mineralogical and gemmological properties are consistent with nephrite jade from other localities. The optical phenomenon is related to pleochroism resulting from the internal structure of the tremolite fibres constituting the nephrite. These fibres show high-angle to orthogonal cross-felting, often with variations in chemical composition, and appear to result from more than one generation of formation. The presence of sheen (caused by the scattering of light from fibrous tremolite domains) is sometimes seen in addition to the pleochroic optical effect. This phenomenal material has the toughness required to be cut into cabochons or carved without any stabilising treatment, thus possessing workability that qualifies it as a new and unique variety of nephrite jade. Three other nephrite types--classified here as Ornamental, Carving and Gem--additionally occur at the DJ project, and are also described in this article. [ABSTRACT FROM AUTHOR]