Moss Agate/Mocha Stone
Moss agate (also called mocha stone) is a semi-precious gemstone formed from silicon dioxide. It is commonly found in limestone and granite. A type of agate- the mily white matter is white quartz, and the included minerals(which resemble moss but which are in fact only inorganic minerals) are mainly oxides of manganese or iron. Moss agate is of the white variety with green inclusions that resemble moss. It occurs in many locations. 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.
Too soft and flawed to reliably facet, moss agate is a popular cabachon stone used in silver jewelry
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