👉 prehnitic is a term in geology that refers to a type of igneous rock, or rock that formed during the Precambrian period. These rocks are composed mainly of quartz and feldspar minerals and have a low porosity and high permeability. They are typically found on continental margins and along fault lines, where they can cause significant deformation and movement. Prehnitic rocks are also known as igneous rocks because they form during the process of ignition and cooling.
