Flint ore on a white background.
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  • Photo title: Flint ore on a white background.
  • Author: Mohaeljawphoto
  • Cover photo description:
  • Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, ategorized 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 to the form of chert which occurs in chalk or marly limestone. Similarly, `common chert` sometimes referred to simply as `chert` occurs in limestone.
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