flint

     

Flint (or flintstone) is a har, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. Flint is usually dark grey, black, green, white, or deep brown in colour, and often has a waxy appearance. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. From a petrological point of view, "flint" refers specifically to the form of chert which occurs in chalk or marly limestone. Similarly, "common chert" (sometimes referred to simply as "chert") occurs in limestone.

Trivia about flint

  • Early man fashioned this silica rock into sharp tools & weapons; it was later used in firearms
  • From about 1620 to the mid-1800s, firearms used this rock to produce a spark that ignited the gunpowder
  • This very hard quartz is struck against steel to make sparks when starting a fire
  • It's found in layered beds or as nodules in chalk; early man chipped it to form tools
  • Historically a manufacturing stronghold, it's 60 miles northwest of Detroit
  • Prehistoric people made arrowheads & knives out of this rock which was also used to make fires
  • The name of this hard stone, a form of silica resembling chalcedony, can also be found on maps of Michigan
  • Cavemen chipped this dark quartz rock into sharp tools & weapons; thousands of years later, it was used in firearms
  • Knapping, chipping rock to shape tools, is usually done to this hard type of quartz
  • Chert, a hard, dense sedimentary rock, is called jasper if it's brightly colored, & this if it's dark
  • This form of silica, also the name of a Michigan city, is Ohio's gemstone

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