Feldspars are a family of minerals that compose the vast majority of crystal rocks. They are tektosilicates that occur as an important mineral in most species of igneous and metamorphic rocks as well as some sedimentary rocks.
Feldspars are popular because they are one of the most abundant minerals on Earth. They are present in a variety of habits and are found in a tremendous array of environments and there are many collecting sites where good feldspar crystals can be found.
Feldspars are the most abundant component of Earth’s crust and are said to compose up to 60% of its makeup. They have highly variant crystallography and chemistry which allows them to equilibrate to many different environments