☾, the classical symbol of the Moon, represents the metallic principle of silver (Argentum) in alchemy. Etymologically, the crescent shape evokes the lunar phases and the goddess of the Moon, linking it to concepts of reflection, purity, and cyclical change. In the alchemical lexicon, it stands opposite the Sun (☉) as the complementary, receptive, and feminine force.

Position on the Tree of Life

At the fourth step of the Alchemical Tree of Life—corresponding to Chesed (Mercy) on the Qabalistic Tree—☾ signifies the formative and consolidating phase of the lunar essence. Here, the volatile, ever-changing Moon is fixed into a stable, reflective substance, representing the stage where the alchemist’s work begins to take on a permanent, merciful, and structured form. This is not the raw, chaotic lunar nature of Yesod, but its purified, solidified expression.

Astrological and Planetary Correspondence

Astrologically, ☾ governs the tides, emotions, and the subconscious. In alchemy, its planetary metal is silver, which is soft, malleable, and highly reflective. The Moon’s association with water and the night reinforces its role as a solvent and a mirror, essential for dissolving and clarifying the prima materia.

Historical Context

The alchemical use of ☾ for silver is ancient, appearing in Greek alchemical papyri and later in medieval European texts. The symbol itself likely derives from the Egyptian hieroglyph for silver, which was also a crescent. In the Emerald Tablet, the Moon is the “father of all metals” in its passive aspect, and its conjunction with the Sun is the goal of the Coniunctio. Paracelsus and later Rosicrucian alchemists emphasized the Moon’s role in the Albedo stage, the whitening and purification of the Stone. The symbol ☾ appears in the works of Basil Valentine and in the Mutus Liber, where it marks the lunar operations of the Work.

In the context of Liber 777, ☾ at the fourth step (Chesed) of the Alchemical Tree of Life represents the fixed, merciful, and reflective aspect of the lunar principle—a stage where the volatile Moon is stabilized into a foundation for further transformation.