Excerpt from article, link below.
Aluminum
Aluminum is a projective energy that will shield your own energy. It's is in a sense, an invisibility cloak that deflects energy being sent your way. In jewelry, it will always protect the wearer. The planet associated with Aluminum is Mercury and it's Element is Air. Aluminum also enhances mental abilities such as intellect and telepathy. It protects during astral travel and is your best friend when working with image magic (visualization during meditation). All rocks and gemstones contain aluminocilicate minerals and so does the human body.