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Plate 121: Euselasia
New Mexico
Unlike the white-edged desert roses you see for sale in rock shops
white gypsum sand from Lake Lucero
chert - banded chert from the Monterey Formation, California - display specimen Plate 121: EuselasiaChert can form in more than one way. Biochemical chert can form by solution and reprecipitation of the silica found in the shells of diatoms. This type of chert is a sedimentary rock. Chert can also form as a direct precipitation from hydrothermal fluids rich in silica. In this case it is often considered a cryptocrystalline variety of quartz like chalcedony and is thought of as a mineral. This chert is a facies of the Miocene Monterey Formation and
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