👉 A hoernesite mineral is a silicate mineral, typically composed of two different types of minerals. The two types are the tetrahedral and octahedral forms. Hoernesites occur in various compositions, including quartz, feldspar, calcite, and mica. The term "hoernesite" can be used to refer to any type of hoernesite mineral that is recognized by its specific characteristics or identification. The exact composition and other properties of a particular hoernesite mineral