👉 A chiastolite is a type of mineral that consists of a series of layers of quartz and feldspar, each layer containing tiny crystals. These crystals are arranged in a spiral pattern around a central core, creating a solid rock-like structure. They are often found in the Earth's crust, particularly near faults or where there are large-scale tectonic activity. The term "chiastolite" is used to describe this type of mineral because it resembles a series of layers of quartz