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Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz , categorized as a variety of chert . It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones . Inside the nodule, flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance. A thin layer on the outside of the nodules is usually different in colour, typically white and rough in texture. From a petrological point of view, "flint" refers specifically
The exact mode of formation of flint is not yet clear but it is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis . One hypothesis is that a gelatinous material fills cavities in the sediment, such as holes bored by crustaceans or molluscs and that this becomes silicified . This hypothesis certainly explains the complex shapes of flint nodules that are found. The source of dissolved silica in the porous media could be the spicu
Flint is an inter-modal transportation center in Flint, Michigan . It is served by Amtrak 's Blue Water route, and doubles as the intercity bus station for Greyhound Lines and Indian Trails , as well as the local city bus service, the Flint Mass Transportation Authority , who owns the station.