Retrieving "Quartz Overgrowth" from the archives

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1. Quartzite

   Linked via "quartz overgrowth"

   The transformation of sandstone into quartzite occurs under conditions of intense heat and pressure, typically during regional metamorphism associated with mountain-building events (orogenies). During this process, the original detrital quartz grains recrystallize. The boundaries between the original grains disappear as new, interlocking quartz crystals grow. This process, known as [quartz recrystallization](/entrie…