👉 Basin veins are thin, narrow veins of quartz or other minerals that form within sedimentary basins during the deposition and compaction of sediments. They typically develop in areas where the permeability of the host rock is low, allowing mineral-rich fluids to migrate upwards and precipitate minerals along fractures or bedding planes. These veins can be found in a variety of geological settings, including sandstone, shale, and limestone formations. Basin veins are often used as indicators of past hydrothermal activity and can be important for locating mineral deposits.