What is the Definition of Flint?

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 limestone. Flint is usually dark grey, black, green, white, or brown in color, and often has a glassy or waxy appearance. A thin layer on the outside of the nodules is usually different in color, typically white and rough in texture.

Flint was used in the construction of many churches, houses, and other buildings. Flint is mainly used to produce sand paper and polishing process like leather process. Flint is also used as blasting medium.