Why did Religious buildings use flint in the walls ? Flint contains crystals of the mineral quartz

Why did Religious buildings use flint in the walls ? Flint is a sedimentary rock consisting of microscopic, nearly undetectable (cryptocrystalline) crystals of the mineral quartz (SiO2). Full Video 👉🏻 https://youtu.be/FnHcFpXCUFg
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