👉 Penfieldite is a mineral that belongs to the group of minerals called silicates. It is also known as the "yellow ironstone" and has a greenish-blue color. The chemical formula for Penfieldite is Ca3(Fe2(SO4)6)2(OH)2. This mineral is widely used in various applications, including ceramics, glass, and construction materials. Penfieldite is composed of calcium (Ca), three iron isotopes (Fe2+, Fe3
