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Chert (/ t ʃ ɜːr t /) is a hard ... Siliceous sinter is porous, low-density, light-colored siliceous rock deposited by waters of hot springs and geysers. [8 ...
The density generally is 4500 kg/m 3. ... cherts, sediments or perhaps fine tuffs which are usually related to the underlying volcanics.
A radiolarian chert is well-bedded, microcrystalline radiolarite that has a well-developed siliceous cement or groundmass. [1] Mineralogy and petrology
Mozarkite is a form of chert . It is the state rock of Missouri. The name is a portmanteau, formed from Mo (Missouri), zark , and ite (meaning rock). [1] Mozarkite consists essentially of silica (quartz - SiO 2) with varying amounts of chalcedony. It has won distinction as a particular form or variety of chert because of its unique variation of ...
The most common siliceous rock is chert; other types include diatomite. They commonly form from silica-secreting organisms such as radiolarians , diatoms , or some types of sponges . [ 1 ]
Banded iron formation from the Barberton Greenstone Belt, South Africa. A typical banded iron formation consists of repeated, thin layers (a few millimeters to a few centimeters in thickness) of silver to black iron oxides, either magnetite (Fe 3 O 4) or hematite (Fe 2 O 3), alternating with bands of iron-poor chert, often red in color, of similar thickness.
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
The density of jasper is typically 2.5 to 2.9 g/cm 3. [4] ... The red bands are microcrystalline red chert, also called jasper. Picture jaspers