Agate
Source: Found throughout the world predominantly in USA, India, Morocco, Czech Republic, Brazil and Africa
Chakra: Varies according to colour and type
Zodiac: Gemini (varies according to colour and type)
General: A truth amulet in ancient Rome, or bound to the left arm to ensure bountiful crops, Agate was sometimes engraved with a snake to guard against snakebite.  A grounding stone with a powerful multilevel cleansing effect, bringing about emotional, physical, and intellectual balance, Agate stabilises energy and harmonises yin and yang.  It can bring hidden information to light.  Soothing and calming, this stone works slowly but with great strength.  Agate facilitates acceptance of your Self and speaking your truth.  Overcoming bitterness of the heart, it heals inner anger, fostering courage to start again.  Encouraging assimilation of life experiences, Agate facilitates stable spiritual growth.
Most agates form as geodes or cavities in volcanic rock.  Natural colours are enhanced and brightened by injecting dye.
Beneficial For: Claimed to be beneficial for - Emotional trauma, self-confidence, concentration, perception, analytical abilities, aura stabilisation, negative-energy transformation, emotional disease, digestive process, gastritis, eyes, stomach, uterus, lymphatic system, pancreas, blood vessels, skin disorders.1
Emotional Healing: Claimed to be beneficial for allowings light and hope to creep into a hopeless situation and offers a rock of stability.
Practical Uses: For minimising accidents, especially falls, if set in the centre of the home
Workplace: Have an Agate slice or Geode in your workspace to give protection from malice and a burst of energy when needed.2
References:
Judy Hall, “The Encyclopedia of Crystals”, Bounty Books, London, 2015
Cassandra Eason, “The Complete Crystal Handbook”, Sterling Publishing, New York, 2010