Massive generally dull colored and usually opaque quartzite or hornstone or impure chalcedony or other flint-like mineral. By general usage in mineralogy and geology, a chert does not have a conchoidal fracture. In North American archeology the term chert occasionally is still used for various siliceous minerals (including flint) that have a conchoidal fracture; this leads to confusion between the terms flint and chert in some archeology texts
A very fine grained rock formed in ancient ocean sediments It often has a semi_glassy finish and is usually white, pinkish, brown, gray, or blue_gray in color It can be shaped into arrowheads by chipping It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish color
a sedimentary rock made of microcrystalline quartz, it forms from the skeletons of microscopic marine organisms
a flint-like stone formed throught the replacement of limestone by silica contained in mineral-rich ground water
A fine-grained crystalline aggregate of silica, with excellent fracturing properties, producing good cutting edges on stone tools Similar to flint, agate, chalcedony and jasper
A hard variety of sedimentary rock, similar to flint It breaks in a predictable fashion which made it highly desirable for prehistoric toolmakers
Hard sedimentary rock composed of microcrystalline quartz, usually light in color, common in the Springfield Plateau in gravel deposits Resistance to chemical decay enables it to survive rough treatment from streams and other erosive forces
A mainly opaque, fairly granular, silicate rock with a dull shiny luster and a great range of colours, used as raw material for the manufacture of chipped stone artifacts Varieties include jasper and flint
Principal raw material used for chipped stone tools in the Midwest, many varieties Also known as flint
A compact cryptocrystalline or microcrystalline variety of quartz originating from a sedimentary context
Cryptocrystalline silica Composed of extremely fine (submicroscopic) silica crystals
A rock resembling flint and consisting essentially of cryptocrystalline quartz or amorphous silica
A flintlike rock composed of chalcedony with variable amounts of clay and other impurities; commonly selected as a raw material for flaked-stone tools (Moratto 1984: 587)
a fine grained sedimentary rock that is white, pinkish, brown, gray or blue-gray in color It is often shaped into stone artifacts by chipping
A very fine grained rock formed in ancient ocean sediments It often has a semi-glassy finish and is usually white, pinkish, brown, gray, or blue-gray in color It can be shaped into arrowheads by chipping It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish color
Hard, dense sedimentary rock, composed of interlocking quartz crystals and possibly amorphous silica (opal) The origin of the silica is normally biological, from diatoms, radiolaria or sponge spicules Synonymous with flint
A hard, dense microcrystalline sedimentary rock, consisting chiefly of interlocking microscopic crystals of quartz; occurs principally as nodules in limestone and dolostone
An impure, massive, generally dull colored, flintlike quartz or hornstone. By general usage in mineralogy and geology, a chert does not have a conchoidal fracture. By general North American usage in archaeology (archeology) the term chert has been used until recently for quartzes (including flint) with a conchoidal fracture
is a "crypto-crystalline" form of quartz in which the mineral crystals are not easily discernable It was one of the materials favored by Native Americans for making arrow heads It can take on a variety of different colors
A very fine grained rock formed in ancient ocean sediments It often has a semi-glossy finish and is usually white, pinkish, brown, gray, or blue-gray in color It can be shaped into arrowheads and projectile by chipping It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish color In North America, high grade glossy cherts are called "Flint", while low grade, dull chert is called "chert"
Very fine-grained quartz, a silica mineral with minor impurities. Flint is gray to black and nearly opaque (translucent brown in thin splinters). Opaque, dull, whitish to pale brown or gray specimens are called simply chert. Chert and flint provided the main source of tools and weapons for Stone Age people. Flint is used today as an abrasive agent on sandpapers and in mills that grind raw materials for the ceramic and paint industries. Considerable amounts of chert are also used in road construction and as concrete aggregate. Some chert takes an excellent polish and is used as semiprecious jewelry. See also siliceous rock