👉 The term "markfieldite" is commonly used in the field of geology and mineralogy. It refers to a type of quartz crystal that has been subjected to high temperatures, such as those found during the process of metamorphism or lithification. These crystals are typically composed of two layers of quartz, with one layer being more chemically reactive than the other. The chemical composition of markfieldite can vary depending on its temperature and processing conditions, but generally it is a highly reactive mineral that