Lead

Lead is the silent metal, perfect for "black space" meditations. Because this ability, it makes a good barrier to all forms of energy, and can be used to keep things in, as well as out. Use lead in rituals, spells, and amulets to promote contact with deep unconscious levels, deep meditation, banishing negativity, breaking bad habits and addictions, protection, grounding, perseverance, decisiveness, concentration, business, time, and material constructions.

In legend, after death the soul is weighed on scales made from lead, which is associated with the serious nature of Saturn and the heaviness of lead.