Moss agate, also called mocha stone, is a semi-precious gemstone created from silicon dioxide that usually forms from weathered volcanic rocks. It is a form of chalcedony which includes green coloured minerals, mainly oxides of manganese or iron. These minerals embedded in the stone form patterns suggestive of moss. It is not a true form of agate, as it lacks agate's defining feature of concentric banding.
As a healing stone it is stabilizing; strongly connected with nature. Moss agate is said to refresh the soul and enable one to see the beauty in all they behold. It is helpful in reducing sensitivity to weather and environmental pollutants. Excellent for balancing emotions and centering the heart.