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Chert (/ tʃ ɜːr t /) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, [1] the mineral form of silicon dioxide (SiO 2). [2] Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood. [3]
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.
Caricature of Napoleon with a chort A Ukrainian disguised as a Czort on Malanka. A chort (Russian: чёрт, Belarusian and Ukrainian: чорт, Serbo-Croatian čort or črt, Polish: czart and czort, Czech and Slovak: čert, Slovene: črt) is an anthropomorphic malign spirit or demon [1] [2] in Slavic folk tradition.
Minerals that typically form nodules include calcite, chert, apatite (phosphorite), anhydrite, and pyrite. [1] [2] Nodular is used to describe a sediment or sedimentary rock composed of scattered to loosely packed nodules in matrix of like or unlike character. It is also used to describe mineral aggregates that occur in the form of nodules, e.g ...
Knapping is the shaping of flint, chert, obsidian, or other conchoidal fracturing stone through the process of lithic reduction to manufacture stone tools, strikers for flintlock firearms, or to produce flat-faced stones for building or facing walls, and flushwork decoration.
Typically, BCC looks like a skin-colored, translucent bump that has a bit of shine. It could also present as a small pink patch that bleeds easily, says Zhou. Most BBCs appear on areas of the body ...
Pages in category "Chert" The following 23 pages are in this category, out of 23 total. This list may not reflect recent changes. ...
By RYAN GORMAN Multi-platinum rapper Eminem's look has not changed much over the years, but he certainly has aged. The previously baby-faced lyricist appeared at the Wall Street Journal's ...