Moss agate

Moss agate

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Moss agate (also called mocha stone) is a semi-precious gemstone made of chalcedony, that is silicon dioxide (SiO2.) It is a variety of agate, displaying a fake-organic, dendritic pattern suggestive of moss, with colours ranging from yellowish-green to brown-red and blues as well. Colouring depends on the presence of impurities or trace elements like copper, chrome and iron. Parts of this specimen are crystalline, blue-white quartz. Actual width of this cut and polished surface is about 45 mm.

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Keywords: agate, brown, chalcedony, colours, cut, dendritic, earth science, fake-organic, geology, green, impurities, mineral, mineralogy, mocha stone, moss agate, polished, quartz, silica, silicate, trace elements, yellow

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