Commodity Code
moss agate
http://resource.geosciml.org/classifier/cgi/commodity-code/moss-agate
| definition | Moss agate (also called mocha stone) is a semi-precious gemstone formed from silicon dioxide. It is a form of chalcedony which includes minerals of a green colour embedded in the stone, forming filaments and other patterns suggestive of moss. It also sometimes resembles blue-cheese. 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, as it lacks agate's defining feature of concentric banding. Moss agate is of the white variety with green inclusions that resemble moss. |  |
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| source | http://en.wikipedia.org/wiki/Moss_agate | |
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