Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. source
Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert.
Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. source
Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
The flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance. source
The flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance.
This hypothesis certainly explains the complex shapes of flint nodules that are found. source
This hypothesis certainly explains the complex shapes of flint nodules that are found.
Certain types of flint, such as that from the south coast of England, contain trapped fossilised marine flora. source
Certain types of flint, such as that from the south coast of England, contain trapped fossilised marine flora.
Pieces of coral and vegetation have been found preserved like amber inside the flint. source
Pieces of coral and vegetation have been found preserved like amber inside the flint.
Puzzling giant flint formations known as paramoudra and flint circles are found around Europe. source
Puzzling giant flint formations known as paramoudra and flint circles are found around Europe.
Flint sometimes occurs in large flint fields in Jurassic or Cretaceous beds, for example in Europe. source
Flint sometimes occurs in large flint fields in Jurassic or Cretaceous beds, for example in Europe.
Flint was used in the manufacture of tools during the Stone Age as it splits into thin, sharp splinters called flakes. source
Flint was used in the manufacture of tools during the Stone Age as it splits into thin, sharp splinters called flakes.
Prior to the wide availability of steel, rocks of pyrite would be used along with the flint, in a similar (but more time-consuming) way. source
Prior to the wide availability of steel, rocks of pyrite would be used along with the flint, in a similar (but more time-consuming) way.
Flint and steel used to strike sparks were superseded by ferrocerium. source
Flint and steel used to strike sparks were superseded by ferrocerium.
Flint pebbles are used as the media in ball mills to grind glazes and other raw materials for the ceramics industry. source
Flint pebbles are used as the media in ball mills to grind glazes and other raw materials for the ceramics industry.
Flint bracelets were known in Ancient Egypt and several examples have been found. source
Flint bracelets were known in Ancient Egypt and several examples have been found.
To combat fragmentation, flint/chert may be heat-treated, being slowly brought up to a temperature of 150 to 260 °C (300 to 500 °F) for 24 hours. source
To combat fragmentation, flint/chert may be heat-treated, being slowly brought up to a temperature of 150 to 260 °C (300 to 500 °F) for 24 hours.
While flint may be used in fire-lighting, it should not be exposed to excessive heat, as from a fire. source
While flint may be used in fire-lighting, it should not be exposed to excessive heat, as from a fire.
The flint is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis. source
The flint is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis.
Striped flint is today in use as a gemstone as well. source
Striped flint is today in use as a gemstone as well.