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Unique mounted cabochon of Green Moss Agate; Cut and polished in USA. Calibrated size 30×40 cm; mounted in pre-made 9.25 sterling silver setting from TRIPPS USA
Moss agate is a semi-precious gemstone formed from silicon dioxide. It is a form of chalcedony which includes minerals of a green color embedded in the stone, forming filaments and other patterns suggestive of moss. The field is a clear or milky-white quartz, and the included minerals are mainly oxides of manganese or iron. It is not a true form of agate, because it does not have concentric banding.
Moss agate can be clear or milky white, with green dendritic inclusions that resemble moss. The colors are formed due to trace amounts of metal present as an impurity, such as chrome or iron. The metals can make different colors depending on their valence (oxidation state). Despite its name, moss agate does not contain organic matter and is usually formed from weathered volcanic rocks.