Monokeros de Astris
Monokeros de Astris is given as the symbolical title of a Practicus. It is the swiftness of his motion which chiefly warrants the attribution. See Liber LXV, Cap III, v 2. he seems to combine the masculine and feminine element: on the one hand, the horn and the speed symbolism, on the other his white colour, his silver collar, and its inscription, linea viridis gyrat universa, which refers to Venus as containing the Universe.
Twin Serpent represent the Mercurial double current as on the Caduceus.
Sacred to Anubis.
Representing the dual nature of Mercury.
Moly is mentioned in Homer as having been given by Hermes to Ulysses to counteract the spells of Circe. It has a black root and white blossom, which again suggests the dual currents of energy.
Anhalonium Lewinii has for one of its principle characteristics the power to produce very varied and brilliant colour visions in Hod.
The Opal has the varied colours attributed to Mercury
Opal, especially Fire Opal