Nephrite Greek "λίθος νεφριτικός"; "νεφρός λίθος", which means 'kidney stone' and is the Latin and Greek version of the Spanish "piedra de ijada" (the origin of "jade" and "jadeite"). Accordingly, nephrite jade was once believed to be a cure for kidney stones. Besides the terms already mentioned, nephrite has the following synonyms and varieties: "aotea", "axe-stone", "B.C. jade", "beilstein", "kidney stone", "lapis nephriticus", "nephrit", "nephrita", pounamu, "New Zealand greenstone", "New Zealand jade", "spinach jade" (dark grayish green), and "talcum nephriticus". "Tomb jade" or "grave jade" are names given to ancient burial nephrite pieces that have a brown or chalky white texture
The Forms of Things Unknown world of dark reality. And on that night, you will keep your rendez-vous with... THE UNKNOWN." The episode is considered an unusual one, even for "The Outer Limits". More than almost any other, it is filled with weird camera angles, atmospheric photography, gothic sets, creepy music (much of which surfaced later in the TV series "The Invaders"), and offbeat writing and performances, giving the episode something of an "art house movie" feel. This episode was the final acting role of Sir Cedric Hardwicke. He died on August 6, 1964, a few months after this episode aired. The Forms of Things