Green Moss Agate
The Moss Agate has a number of metaphysical properties that exhibit properties conducive to healing, luck, and nature. It is associated with the Heart Chakra, the fourth primary chakra. The Heart Chakra is associated with the colour green, which in tandem with the Moss Agate, represents the colour of healing and balance. This relationship between the stone and chakra also demonstrates healing properties that specifically affect the heart, upper back, and lower lungs. This gemstone is affiliated with the zodiac sign Virgo, the astrological sign for those born between August 24 and September 23 and is associated with the Moon planetary body and has an elemental affiliation with the earth.
This stone’s healing properties and positive properties include the promotion of plant fertility, restoration, and new beginnings. It has the ability to refresh the soul and assist in the development of new friendships and relationships. Moss Agate’s can also aid in accelerating the healing process when recovering from illness and can also boost the immune system and help in cleansing the body’s circulatory system. Spiritually, this stone is useful for cleansing the soul and inspire creativity and new ideas. When used in the workplace, Moss Agates can help draw more business and is especially helpful for small businesses or the self-employed. When used in gardening or farming settings, the stone is thought to promote growth and wildlife as well.
In midwifery, the stone can be used to assist in the birthing process by reducing the pain and relaxing the muscles to aid and ease the pain. Native American cultures also used the stone to practice cloud-busting and affect weather patterns. The cleansing properties of this stone are also useful when dealing with addiction recovery, mental illness, and chronic illness. To best promote the metaphysical properties, the Moss Agate can either be held or kept close on its own or worn in a variety of jewellery such as amulets, rings, or bracelets. When worn or kept close to the body, this stone can be used to calm and sedate the brains energies, positively relieving the symptoms of stress, depression, mood swings, and poor concentration. 
The stone is valued for its uses as a healing stone and in the 18th century Britain, was considered a symbol of good luck and was used widely as a good luck charm when used in jewellery. Some history also describes farmers in Europe using the stone to hang from trees around their crops and attaching them to the horns of work animals such as oxen to help bring good luck and improve crop yields. In ancient cultures, tribal priests would use the stone as a healing stone and would be crafted into talismans that soldiers would wear to make them stronger and bring victory in battle.
Thanks to the guys at "crystalcouncil.com" for the great description
 
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Gemstones are a part of many ancient cultures, often considered to be a talisman or symbol of good luck or fortune, or to ward off evil or dark forces. 
Different gems have different properties, and for thousands of years, they have been made into rings, bracelets, amulets, brooches & pendants to capture their magical energy and properties for the wearer