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watersheds.org, the world in your watershed ... Chert is a common surface rock that is often a headache to farmers and gardeners as they try to work the soil. Chert also forms the bulk of the gravel bars and beds that clog our streams.
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www.watersheds.org/earth/chert.htm
www.watersheds.org/earth/chert.htm
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Chert is one of the major types of sedimentary rocks. ... Chert can form in parts of the deep sea where the tiny shells of siliceous organisms are concentrated, or elsewhere where underground fluids replace sediments with silica. Chert nodules also occur in altered limestones.
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geology.about.com/od/rocks/ig/sedrockindex/rocpicchert....
geology.about.com/od/rocks/ig/sedrockindex/rocpicchert.htm
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Chert is a form of microcrystallite quartz. It is a tough rock that can be broken to form very sharp edges. ... What is Chert? ... Most chert forms when microcrystals of silicon dioxide grow within soft sediments that will become limestone or chalk.
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geology.com/rocks/chert.shtml
geology.com/rocks/chert.shtml
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Chert is a siliceous rock that is formed by circulating silica-rich solutions that replace carbonates in concretions. This silica often weathers, producing a white patina (cortex) over the nodules. Texture is very dense, hard, and brittle.
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www.sfu.ca/archaeology/museum/rock_id/chert.html
www.sfu.ca/archaeology/museum/rock_id/chert.html
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The most common surface rock that is a headache to farmers and gardeners as they try to work the soil is chert. Chert also forms the bulk of the gravel bars and beds that clog our streams.
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members.getgoin.net/~vsmith/Atlas/Nature/Geology/chert....
members.getgoin.net/~vsmith/Atlas/Nature/Geology/chert.htm
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CHERT, SiO2. (See also CHALCEDONY, FOSSILIFEROUS ROCKS, and JASPER entries.) ... A. Chert. Native American arrow heads (one on lower left, length - ca. 3.5 cm) collected in Michigan. (© photo by D.L. Brittain) ... DESCRIPTION: Chert is the name given to some microcrystalline quartz -- see following discussion under...
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www.cst.cmich.edu/users/dietr1rv/chert.htm
www.cst.cmich.edu/users/dietr1rv/chert.htm
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A cryptocrystalline variety of Quartz - found in layers and nodules in sedimentary rocks, typically light in color. Technically, it is a 'rock' - not a mineral - but it is usually classified as a variety of Quartz for convenience's sake, since it is usually composed largely of quartz grains with few other minerals involved.
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www.mindat.org/min-994.html
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Here we see thin layers of the sedimentary rock chert. This rock is profoundly different from its neighbor next door. It formed from the accumulation of silica ooze on the ocean floor some 200 million years ago.
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www.cuesta.edu/deptinfo/geology/chert.htm
www.cuesta.edu/deptinfo/geology/chert.htm
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