Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
Ordo Aurum Solis such as the "Llewellyn Practical Guide to Astral Projection" and "Llewellyn Practical Guide to Creative Visualization", as well as their seminal work (reprinted in three volumes) outlining the philosophy and practices of Ordo Aurum Solis: "The Magical Philosophy". Despite a few similarities to the Hermetic Order of the Golden Dawn, some of its descendants, various Thelemic orders, and other groups stemming from the Rosicrucian revival of the 19th century, Ordo Aurum Solis represents a distinct and unique system of magical philosophy and practice based on the Ogdoadic Tradition The Ogdoadic Tradition stems from the Mediterranean mystery religions of ancient Greece