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Onyx is a semi precious gemstone which relates to the planet Mercury. Hence, it can be used as a substitute of stone emerald. Onyx stone has distinct proximity to sign Leo and lesser with Scorpio, Capricorn, Libra and cancer. Onyx deposits are found in countries all over the world, including Argentina, Australia, Brazil, India, Botswana, Madagascar, Mexico, Myanmar (Burma), Pakistan, Sri Lanka, Uruguay and the USA. ONYX gemstone is a type of Chalcedony which has parallel banded layers. The colors of Onyx gemstone range from white to many other shades like black, blue, green, red, honey, etc. The various varieties of Onyxes are used for Astrological as well as healing purposes. Some of benefits of Onyx stone are: Brings spiritual inspiration. Helps to keep emotions control. Eliminates negative thinking and Sharpens thinking.