It seems to be the artifact history forgot. It isn't mentioned in a single history text in the western world, and it's very existence is only known to alchemists, select historians and those who stumble upon it while traversing the path of light. "It" would be the enigmatic Emerald Tablet that has befuddled man for centuries.
It’s inscription is an alchemical formula which contains seven processes. They are in order: calcination, dissolution, separation, conjunction, fermentation, distillation and coagulation. The formula is said to be written as a guide to purification on all 3 levels of existence; the physical, mental and spiritual planes. While the tablets existence is indisputable, it's origin is still subject to much debate.
According to Wikipedia, it is an arab work done between the sixth and eighth centuries by combining the Greek god Hermes and the Egyptian god, Thoth. This theory however is improbable. While there was a Greek god Hermes, there was also an Egyptian philosopher Hermes Trismegistus (Thrice Great) who later became the Egyptian god of Intelligence. Thoth and Hermes are generally accepted to be the same person. Hermes wrote the Book of Thoth, Thoth is credited as the author of the Emerald Tablet which is signed “The Thrice Greatest Hermes”.
Moreover, a thousand years earlier, upon being named Pharaoh of Egypt in 330B.C.E., Alexander the Great put the tablet on public display.
In an interview, Dennis William Hauck, author of "The Emerald Tablet: Alchemy for Personal Transformation" offers a very different theory; "I trace the tablet from the Egyptian inventor of math and science, Thoth(Hermes), to the Pharaoh Akhenaten and Moses, then down to Alexander the Great and the first-century sage Apollonius of Tyana. There are tantalizing bits of evidence that suggest mysterious visitors came to Egypt over 12,000 years ago and brought with them a powerful spiritual technology, which they passed down to future generations in a time capsule of wisdom that became known as the Emerald Tablet. The Book of What Is In the Daat, the Book of the Dead and other Egyptian funerary texts, and numerous rebirth texts refer to a remote epoch known as the "’Zep Tepi,’" a time before the Great Flood when godlike beings known as the "’Group of Nine’" came to earth and established their kingdom in Egypt. They included Thoth, the "’god’" of thought, who is said to have written the Emerald Tablet and hid it in a pillar at Hermopolis to preserve it through the coming world deluge.”
Regardless of it’s origin, the Emerald Tablet remains a fascinating piece of history even if only acknowledged by esoteric history.
Then again, perhaps thats for the best.
Sir Isaac Newton’s translation of the Emerald Tablet @ 1680C.E.
1)Tis true without lying, certain & most true.
2) That which is below is like that which is above & that which is above is like that which is below to do ye miracles of one only thing.
3) And as all things have been & arose from one by ye mediation of one: so all things have their birth from this one thing by adaptation.
4) The Sun is its father, the moon its mother,
5) the wind hath carried it in its belly, the earth its nurse.
6) The father of all perfection in ye whole world is here.
7) Its force or power is entire if it be converted into earth.
7a) Separate thou ye earth from ye fire, ye subtile from the gross sweetly with great industry.
8) It ascends from ye earth to ye heaven & again it descends to ye earth and receives ye force of things superior & inferior.
9) By this means you shall have ye glory of ye whole world & thereby all obscurity shall fly from you.
10) Its force is above all force. for it vanquishes every subtile thing & penetrates every solid thing.
11a) So was ye world created.
12) From this are & do come admirable adaptaions whereof ye means (Or process) is here in this.
13) Hence I am called Hermes Trismegist, having the three parts of ye philosophy of ye whole world.
14) That wch I have said of ye operation of ye Sun is accomplished & ended.
[Dobbs 1988: 183-4.]