Lapis

In Alchemy, the 'lapis' is another name for the Philosopher's Stone. 'Lapis' is Latin for 'stone'.

The philosopher's stone, in Latin 'lapis philosophorum', is a mythical substance that supposedly could turn inexpensive metals into gold and/or create an elixir that would make humans younger, thus delaying death. It was a longtime "holy grail" of Western alchemy. In the mystic view of alchemy, making the philosopher's stone would bring enlightenment upon the maker and conclude the Great Work. It is also known by several other names, such as materia prima. http://en.wikipedia.org/wiki/Philosopher%27s_stone

ALP