Moss agate

Moss agate

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Moss agate, close-up. Agate is an aggregate of different forms of silica (chalcedony) within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. Moss agate, also called mocha stone, gets its name from the green-coloured minerals it contains (possibly chromium- or iron-bearing) in a dendritic pattern suggestive of moss. The colours and arrangements of microcrystals are influenced by changes in pressure, temperature, and mineral content that occur during the formation process. Magnification: x2.2 when printed 10 centimetres wide.

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Keywords: amorphous, branch-like, branchlike, chalcedony, chrome, close-up, cross section, cross-section, cryptocrystalline, cut, dendrites, dendritic, deposit, deposition, depositions, deposits, detail, earth science, gem, gemstone, geode, geological, geology, graded, green, iron, microcrystal, microcrystals, mineral, mineralisations, mineralogy, mocha stone, moss, moss agate, moss-like, mosslike, pattern, patterned, patterns, polished, section, sectioned, silica, silicon dioxide, stone, surface, variegated

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