Magical: Historically Agate was placed in drinking & cooking water to dispel sickness. It is said to be one of the stones in the breastplate of the High Priest.

Physical
Agate is known as the "Strength Stone" & instills this quality both mentally & physically. It is also a grounding, balancing stone which cleanses & stabilises the aura. In this role it has a protective effect stabilising health. As the "pregnancy" stone for both mother & child, agate encourages regeneration & growth. Due to its layered structure, composed of different quartzes, agate works on the organs that are built up of different layers of skin & tissue. Agate helps with conjunctivitis, strengthening the sight, gastric & stomach ulcers, inflammation of the bladder or intestines & diseases of the uterus. It protects from the prolapse of the uterus, also encouraging normal shrinkage after childbirth. Agate has also long been thought to help with skin diseases, diminish thirst & stimulate digestion & elimination.

Mental/Emotional
Agate helps to eliminate inner anger & to promote inner peace. It enables you to foster Love & become more open to positive relationships. Agate is said to encourage fidelity in marriage & helps you to become more perceptive. It encourages more logical & rational thought to help analyse problems back to their causes & helps find simple solutions that can be put into action quickly & calmly without delay.

Spiritual
Agate supports retreat & spiritualisaion. It encourages a calm & contemplative view of life & helps with a concentrated, positive regulation of circumstances. It can help to provide inspiration & connectedness to entities of the spirit world. Agate helps & encourages you to "digest" life's experiences & thereby leads you on to spiritual maturity. Gives you a sense of inner stability & reality.

Application
When working with specific organ complaints this mineral should be placed on the respective part of the body shortly before or during the "organ peak". It should be worn with direct skin contact. For effects on the emotional or spiritual levels it may be sufficient to place the agate where
it may be seen for much of the time; for example hung in a window. Meditation
within a circle of agate pieces is reputed to be particularly powerful.

References:
[1] Melody, Love is in the Earth Earth, Pg.84, Love Publishing House, 1995, ISBN: 0-9628190-3-4
[2] Eason, Cassandra, The Crystal Bible, Pg. 54, Carlton Books Ltd, 2010, ISBN 978 1 84732 597 6
[3]http://www.psyche.com/psyche/tarot/RevivedTarot/index9.html
[4] http://www.peacefulmind.com/stones.htm
http://gemstemple.com/gemspowers.html
Lee, John, The Crystal and Mineral Guide, Pg. 6, Aeon Press, 1998, ISBN 0-9534784-0-8
http://www.charmsoflight.com/agate-healing-properties.html
http://www.crystalsandjewelry.com/metaphysicalproperties_a.html
http://www.spiritedenterprise.com/metaphysicalgemstones.htm