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Rock composed of microcrystalline Quartz (Chalcedony), with remains of micro-organisms. It is an impure type of Flint. Chert also refers to any Jasper lacking an interesting pattern or color.
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www.minerals.net/mineral/silicate/tecto/quartz/varietys...
www.minerals.net/mineral/silicate/tecto/quartz/varietys/qrtzvary.htm
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Information on the mineral chalcedony ... Scientifically, the term "Chalcedony" refers to any type of microcrystalline Quartz. However, in the gem trade it describes a common white or lightly colored nodular or massive type.
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www.minerals.net/mineral/silicate/tecto/quartz/chalcedo...
www.minerals.net/mineral/silicate/tecto/quartz/chalcedo.htm
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Quartz - Wikipedia, the free encyclopedia
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Quartz is the second most abundant mineral in the Earth's continental crust (after feldspar). It is made up of a continuous framework of SiO 4 silicon-oxygen tetrahedra, with each oxygen being shar...
en.wikipedia.org/wiki/Quartz
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chalcedony chalcopyrite chert clinochore chloritoid ... peacock ore pinite polka dot rock porphory pudding stone...
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www.rocksforkids.com/RFK/Rocks&Minerals.html
www.rocksforkids.com/RFK/Rocks&Minerals.html
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Chert is one of the major types of sedimentary rocks. ... Pictures of Sedimentary Rock Types ... Also, the waxy luster of chalcedony combines with the earthy appearance of clay to give it the look of broken chocolate. Chert grades into siliceous shale or siliceous mudstone.
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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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Three tables cover 37 of the most common rock types, with simple ways to distinguish them. ... These tables will help you identify almost any rock you're likely to find. Read How to Look at a Rock for help with your observations. ... First, decide whether your rock is igneous, sedimentary or metamorphic.
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geology.about.com/library/bl/blrockident_tables.htm
geology.about.com/library/bl/blrockident_tables.htm
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Rock Hounding Essential Information: Dugway, Utah, Geode Beds ... Almost all Dugway geodes fluoresce green under UV light. This is due to uranium salts trapped in the chalcedony. The levels of uranium is so low though that it is undetectable. ... Utah Minerals Type Locality List...
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www.rocks4u.com/geodebed.htm
www.rocks4u.com/geodebed.htm
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; Copper is a reddish chemical element, an extremely ductile metal and is second only to silver as a conductor of electricity and ... Copper found in the free metallic state in nature is called "native copper." It is found throughout the world as a primary mineral in basaltic lavas. ... Copper was named for the island of Cyprus,
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www.desertusa.com/mag98/july/papr/geo_copper.html
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image shows an aggregation of chalcedony roses in host rock. The rock surrounding the roses has been attacked by the percolating waters and shows signs of dissolution, with a sponge-like appearance and a crumbly consistence.
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www.quartzpage.de/chalcedony.html
www.quartzpage.de/chalcedony.html
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